CC head buttons repair

[Konstantine Bogach]

Hi All,

I just finished heater core replacing job.  Now intermittently working 
buttons on CC head started bothering me all of sudden. Sometimes they 
start working after I tap on the head.   I put up with it for 2-3 years. 
   But now, when I have a new heater core,  I find it unacceptable.   Is 
there a recommended procedure for fixing it?  Oh... the patient is S4 '93.
I remember coming across a post where a shop for CC head repair was 
recommended.   I can not find it.   Please, let me know the contact if 
you happen to know it.

Thanks a lot.
Konstantine Bogach
S4 '93