A week ago I brought my riding mower in to have work done on engine.The engine was removed and repaired. the mechanic put everything back together and now he tells me the transmission is locked up. The transmission was working find when i brought it in. Could he have done something wrong when he put everthing back together. A new transmission is very expensive. The transmission is a hydrogear mdl# 322-0510(171613). Can someone please help me on what to check or do.You can email me: email@example.com. Thanking you in advance.