Welcome to the friendliest virtual RV Park in cyberspace!
I don't know of any sites that specifically list known problem areas. You might want to have someone go with you to look over the RV. (Preferably someone with lots of experience looking over RV systems.)
We looked at the 37RB models; but couldn't swing the dollars.
They sure are a beautiful rig!
(Out Toad would even fit in the garage...)
Happy shopping, and good luck!