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Chances are the deck drive belt has been knocked off one of the pulleys or the drive clutch won't engage properly. With the spark plug wire removed, rotate the blades by hand and make sure they both move together. This verifies the blade linking belt is OK. Now engage the blade operating control and feel for resistance as you rotate the blades. If you feel no change in resistance, remove the belt cover and reinstall the drive belt over the pulleys and tensioner/clutch mechanism.
Check to see if one of your deck spindles isn't seized. Disengage the blades and turn each blade to see if its free. Sounds like either a spindle is seized or your electric clutch on the motor has a problem.
It's possible the repair folks didn't properly reinstall the mower deck belt. Check that it's in place, and under good tension. If that's OK, look at the wires to the mower engagement switch (PTO switch) and make sure the connections are on tight. Then check the motor pulley where the PTO clutch is, making sure those wires still in place.
sounds as though you are on the right track
but be sure to check the wiring directly from the electric clutch on the front of the motor back to the switch
a wire could be pinched in the frame and shorting out intermittingly
look around and find those wires and move them around and look for chaffing and tightness
and what you could also do is to unhook the clutch at the connection to it at the front of the motor and engage switch and ride around and see if fuse blows and if not you may have an electric clutch issue
common complains for electric & cordless mower is that they are not ment for cutting on wet or dump grasses or long tall grasses they will bog down. for this type of unit blade should be extremely sharp. also clean the under the deck so you can better air flow for the blade. if your switch & rectifier are new & in right connection then have you armature check for short circuit..