Ive known a lot of people that just used it as is and waited for the parts then took it back in the "off season". To each their own, I am just glad I never had a problem with mine (since Ive taken possession), there was a problem but it was found and fixed during the PDI and I waited an extra week to take possession.
Just out of curiosity did you do a PDI of everything, like have them hook up and test/show you all the systems? It seems like that could of/should of found the problems mentioned. If you end up getting rid of this one, the next one have them do a full on PDI and test, fill all the tanks and run all of the appliances (this is what I did before I signed my paperwork). Good luck and I hope it works out for you. I couldn't be happier with my TT.
2015 Forest River EVO 2850
2012 Dodge Ram 2500 6.7 Cummins
Yamaha 2k x 2 with parallel cable
EMS 30 PI portable w/ Edison plug
Nights Camped (2016-13) (2015-13)