You might think about popping over to the dealer and eyeballing their assesment if you have a few minutes. Do they have service there ? or do they send it over to Rick's or someone eelse like that?
since it might be coming down a vent or thru a wall, i would be real interested in keeping a watchful eye on just what they are finding and how they react
good luck! and out of curiosity, what model do you have?
F350 PSD 4x4 SRW, BanksBrake, FOX res shocks, MagHytec, DP tuner, JohnWood tranny;
'63 hog; ChrisCraft Launch VP8.1 ;
3 hound dogs