I have a Husqvarna LTH 1438 riding mower that I'm having a problem with. It will not go in gear. I removed the deck and the drive belt is in good condition and tight. The little wire rod that you pull out to disingage the transmission to push it doesn't seem to work. It stays disengaged all the time. The rod is hooked to a lever on the tranny and that moves but the tranny will not engage. I was told by the dealer that there are no servicable parts available inside the tranny but I'm stubborn. The engine works great and the deck and mower are in good condition to just throw it away. If I take the tranny off the mower and open it up, is there anything inside that I can work on? Has this problem ever been fixed before?