Well, first mistake is that you took the word of a dealer, on a used hybrid.
you should have made a pressure leak test part of the deal.
then you took it home and apparently never checked the bunk ends for 3 months, during the winter, when seals can be comprimised from cold and rain.
owning a hybrid requires more vigilance/maintenence than a regular TT.
especially on a used hybrid where you have no idea if the previous owner took care of it and maintained it.
Your only options at this point, is to to take it back to the dealer and raise hell with them.
the other option is to attend the Goshen Rally and see if the factory techs will help.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC