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Gecko board problem / ozonator circuit

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treacherous:
I apologize to just dropping in here like this since it is my first post.

You seem like a knowledgeable group here so I would like to know your thoughts.

[Background]

2000 Apollo Spas Explorer Model with Gecko MSPA-1 / 9911-500102 REV:E
MSPA-1-P122-P212-B2-O2-LS-HV-AMP-T2-AP
4713-01A

Configuration:
-Pump 1 (Low/High)
-Pump 2 (High)
-2 Speed Blower
-No circulation pump
-Ozonator

About a month ago I noticed my tub wasn't heating and traced it back to one of the heater relays on the board.

Everything else on the tub including ozonator appeared to be operational.

One of main relay terminals to heating coil was slightly charred.

I went online and bought a pack of Zettler Relays (AZ2150-1A-24DEF) - http://www.onlinecomponents.com/american-zettler-az21501a24def.html?p=10610392



I ended up replacing the following relays next to P28, P27 and P35.  The one near P28 had the charred terminal.



I got everything back together and score my heating issue was addressed; however the board
would no longer drive power to the ozonator circuit
 
It would show on the display when ozonator was on but no power.  I re-pulled the board and swapped
what appears to be the ozonator relay (near P11) with a new one.  I also tested for continuity on all fuses
including one that says ozonator and they all check out as good.

Anyone know if there is another relay or chip on this board that drives the power to the ozonator circuit?

I see no other charred circuits or cold soldered joints.

The ozonator worked before I replaced the affected relays but unsure if when the initial heater relay
went bad it sent a surge to something else that still provided power to ozonator circuit but not when
heater relay problem was fixed.

I've emailed Gecko for a detailed schematic but doubt that I will get one in this day and age. 

https://www.geckoalliance.com/

Any thoughts on how I should proceed or do I just need to suck it up and buy a new spa pack?  Could the board transformer power supply cause issues like this?  or is that all or nothing?

I did get a 14 year run on this one.

Thanks!
Treacherous

treacherous:
EDIT:  Fixed pictures

I decided to replace remaining relays just to rule that out.  In doing so I tested some of the resistors and found the one next to the Pump 1 low as open.  I need to source a 33 ohm resistor.  It seems I read Ozonator relies on Pump 1 so this is either a red herring and doesn't affect anything or could be my fix.

treacherous:
All the other resistors test out Ok.  Only this one is bad.  I should have replacements in a week and will let you know if this fixes it.

Jacuzzi Jim:
 I am amazed you are doing what you are doing, so nice job.   That being said why not just splice the ozone into the one 110 leg going to pump one, or both legs if your ozonator is 220.   Or just scrap the ozone and use a Nature 2 stick.. 

treacherous:
Thanks!  Any time I can save potentially hundreds of dollars I figure it is worth some of my time.  :)

I might do what you suggest if this resistor replacement doesn't fix it.  Maybe overkill but I have always run Nature2 with my Ozonator

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