Don't give up now!!! Keep looking and trying. Even if you find the problem but can't fix it you will have the satisfaction of knowing what it is before the dealer.
One time I took my mower to the repair shop cause I had some smoking and noise that I couldn't see. Turned out to be a rag, had I looked a little harder or taken a few more minutes...then there was the time the engine won't start on another piece of equip., my small engine guy came over, said Did ya check tha fuse?). My point? Don't give up till the cows come home and you 're so darn frustrated.........
Good luck and hunting!!!
Just take it to the dealer before you take a hammer to it!!!
Eric P.