it almost looks like a repair to replace a bad trace. it is hard to tell but if you look at the 2nd picture and try to look under the wire on the right side it looks like the trace may be bad right there. good chance that is a repair for the refurb.. just look close under the wire for a bad trace. if the radio works as it should leave the wire alone.
no need to try to repair a radio that is working just fine.
I bought a 29LTD chrome a few months back and it seems to work a little better than my old side mic 29LTD radios. one of the plus for the chrome version is the talk back out the front of the radio.