I don't know what failed on mine.
The controller IC had a Kwikee part number on it and I couldn't check it. The FETs and other parks I could check, checked okay. Like most boards today it's pretty hard to troubleshoot them unless you have a schematic and part numbers.
Although I had bad luck with two controller boards I don't read or hear about many of them failing - that's the good news.
It would be pretty easy to design a circuit using mostly diodes. FETS and maybe a few logic gates. The logic would help with the safety lockouts and maybe the two at a time ram activation. The switches could be done with mechanical momentary push-buttons - not as sexy but sure more reliable.
The problems implementing the design would probably be locating the right connector to mate with the existing one and identifying which wires connect to which solenoids. On my installation the solenoid and pump are a little hard to get to.
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Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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