Whirlpool s20b on the blink

I have read the posts on this one. I could do with some advice please. Model no is 8586 151 15011 and 11 0402 011765, the fridge has blinking lights on the exterior, it cools Ok.

I was hoping it was just the rear circuit board, this had been changed out within 4 months of the fridge arriving in April 2004/i.e. board change summer 2004. I swapped out the rear board, but still get the same blinking effect and the new board didn’t fire the compressor, hence I put the old one back with the lovely crackly (arcing) capacitors! at least I havea cold fridge.

I guess I need the front board too (wherever it lurks) and am hoping that you can confirm this. This will now require a call out as I am running out of time, I will call Whirlpool and have a serious grumble as the build quality and components are shoddy, 2.25 years is not good enough . I was surprised to find the old board in the rear as I thought I may have a got a new one, when the engineer visited last time.

Any help and advice is much appreciated, thanks