I have an idea to help, but I need to know howmany beeps ift is giving.The mpem is telling you the problem by the beeps. Listen and count them. If it is 4 beeps it is in gear. 1 beep means it isn't reconizing the DESS,(Digital Electronic Security System), by the MPEM,( Multi Purpose Electronic Module). You could try this in the mean time.
I would start by cleaning the Post on the safety lanyard. It is beeping and saying it isn't connecting to the Mpem, (Multi Purpose Electronic Module). It needs to beep 2 times to let you know it is ready to start. Clean the post and cap with soapy water. Don't use any grease of lubricant on it as it needs a clean connection to make contact. Connect the lanyard to see if it is making a connection. 2 beeps and it's ready to fire up.
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Keep me posted on your progress or get back with the beep count.
Karl