[Elecraft] Advice on repairing K2

[K8RS]

K2 Guru's,
                While checking out a receive antenna for 80/160, I seem to
have damaged the 80/160 section of my K2.  The receive audio is  way down on
both bands compared to 40M-10M.
               The strange thing is that while I have better receive audio
on 40M through 10M, there is little or no transmit output anywhere.   It
looks as if the transmitter is shutting itself down even though the antennas
have very low SWR and work fine with my 1000MP.  Tests into a 50 ohm dummy
load confirm these  findings.
              What do you think I have done?  I have turned the receive
antenna off via menu and am now working directly into a dummy load   What
suggestions do you have for locating the problem?
               I will start working on the problem this afternoon and would
welcome any pointers, ideas or help
               Thanks,
                           Roger K8RS S/N 3478