[Kenwood] TS-930 intermittent deafness and indicator lights

[Barry Baker, K4CZ]

During the past 1-2 weeks I noticed that my TS-930 seems to lose receive
sensitivity on an intermittent basis.  I've noticed the problem on 160m/80m
but it may be occurring on other bands also.  I can still hear strong
signals but not weak signals...almost as if 10-20dB of attenuation has been
switched in.  When the problem occurs, the S-meter seems to get "stuck" at
S-2 or S-3 regardless of received signal strength.  Initially, I thought it
might be a de-sense problem related to strong nearby signals but it seems to
occur across the band and turning AGC on/off has no effect.  I can sometimes
"fix" the problem by transmitting or turning the rig off and then back on.
I did a Google search and found a reference to similar problems.  The
suggested solution was cleaning the signal unit connectors with contact
cleaner.  I plan to try that solution this weekend but wanted to see if
anyone had other suggestions.  I would also appreciate any recommendations
regarding cleaning procedures and brands of contact cleaner.
 
I've also noticed another problem, which appeared about the same time.
However, I do not know if the problems are related.  The on air, ant tune
and notch lights on the front of the rig have also become intermittent.  The
actual functions are fine but the lights occasionally stop working.
However, I found that I can often "fix" this problem by pressing down on the
top of the rig on the front left side.  The problem does not affect the
frequency display or S-meter lights.  Any suggestions for this issue would
also be appreciated.
 
73, Barry K4CZ