my 2007 335 has a leak from swing motor/carrier. Pulled the belly plate off and noticed leak from center of carrier.I bought a seal kit and pulled the floor plate in the cab to scope out before undertaking job.Few ? Is the leak most likely from the swing motor or carrier? Does the carrier get hydro fluid from the motor? Is there anything that can be replaced without removing motor/carrier? Should I remove motor carrier and have pro repair? Thanx