Sounds like you are in a good DIY frame of mind, so maybe some good info might be the thing to help.
There are often really good troubleshooting manuals online if you do not have any good info in an owners manual??
With the exact model number, I would go for trying to find a manual with far more indepth info than many of the manuals we get with the RV, etc.
I will send this along but then it may be something you have found and tried already??
Best I've got from here:
But I may not know when I am looking at the right or wrong manual, so keep that in mind and match what you have with what you find better than my possible guess?