Trigger operates sporadically

My 755 has been a great amp. Almost 10 years old now and it still sounds amazing. My trigger turn on circuit is giving me problems however, and im almost 100% sure the 3mm mono socket on back of the 755 is the problem. Fitment, when inserting the cable is loose, as if the contacts inside have relaxed and only touch intermittently. I know the circuit needs to be satisfied all the time, or it powers off. I have 5.5 volts coming out of the trigger ports of my 976 and Outlaw support says that is sufficient. Ive tested this voltage supply from the 976 and it remains constant.
I either need to repair this socket or eliminate the turn on circuit.
Anyone have experience with this issue ?
I see there was discussion about this about 4 years ago, but no resolution was posted !