TRC 451 Low Transmit

[cbjunkie]

I have a trc 451 that has low transmit. I took it in to the repair shop and it was reading 3 on transmit and then would drop off to zero. now it just sits at zero no matter what antenna i use and the swr meter even on calibrate reads about 1.2 and swr reads 1. Anyone have any idea's as to what this problem might be. I also noticed that when the center plug for antenna cable is in but the connector is not tightened down then on transmit the signal jumps up to about 5lbs on the signal meter. The cb was at the repair shop for about 5 months and they had no idea.