Need help keypad troubles 2000 Air Nautique

Hey, good memorial day weekend everyone.
It's been a rough start to the year already. water impeller died leaving me stranded on the lake for a bit. Got the anchor stuck on something good and had to leave it behind. Thought (and still pretty sure) my battery went dead so had to get it replaced. Finally, I'm now experiencing intermittent dead keypad issues.

I'm trying to debug what's the culprit, left start/stop keypad, right keypad or the main PME. Could use some help and advice on the best way of doing that. Sometimes the whole system acts dead, no response lights or anything. I haven't figured out a rhyme or reason to it, but sometimes by de-powering the system and repowering, or just pressing a lot of random buttons I can get some response. Sometimes just the blower to turn on, one time the horn went off and didn't stop. And these are delayed responses too. For example,
I press the horn, then press 50 other buttons. Finally, later time, the horn goes off.

Another scenario, I plug in the battery, everything starts up. I crank over the engine, turn the engine off, run the blower motor. Let it sit powered up w/ the blower motor running for 5 mins. Come back and the whole keypad is unresponsive. Can't get anything to work, turn on or turn back off.

I've yet to get the bilge pump to turn on. I understand this should turn on regardless of entering the code? The lights on the right asc. keypad went out original to me buying the boat several years back.

That's all i know at this point. Advice on what's the likely culprit or what I could do to further debug the system is much appreciated.

Thanks
Pete

Thanks. Guess I'm opening everything up today to start tracing the v's. I'm doubtful this is the issue, but I should probably rule it out.
Thanks