[Elecraft] K3 radio no receive no transmit

[John K9UWA]

My K3 is acting up a bit. No Receive No Transmit. I operate this radio 
remotely so all I can tell you is that it appears to be all working as per the 
HRD screen I am looking at. The radio appears to switch to transmit and I 
hear the monitor CW being sent but no output on the wattmeter.  The only 
noise coming from the radio is inter radio noise it the volume is turned to 
max. A slight TAP on the top of the case and the radio goes back into 
perfect normal operation. I am guessing that some plug someplace inside 
the radio isn't making proper contact. 

Does anyone have any idea which plug and its location?

Thanks
John k9uwa
John Goller, K9UWA & Jean Goller, N9PXF 
Antique Radio Restorations
k9uwa at arrl.net
Visit our Web Site at:
http://www.JohnJeanAntiqueRadio.com
4836 Ranch Road
Leo, IN 46765
USA
1-260-637-6426