Yesterday after mowing and mulching large piles of leaves my GX345 will not engage the pto when the dash lever is pulled up. I have power to the switch and I have taken apart the last connector prior to the PTO (checking for corrision) and when applying 12V direct from ther battery the PTO kicks in. What safety switches besides the seat are there. What shuts the mower down when you go into reverse?--This is what is suspect. Thanks for your help.