[Elecraft] K3: PTT In - quit working

[RLVZ at aol.com]

Hi Guys,
 
When operating SSB, about a month ago my  Foot switch cable to the K3 "PTT 
IN" on the rear panel quit working.   I tried a second foot switch that I 
know is good, and that one  won't key the K3 in SSB mode either.   I'm 
wondering if  the K3 has an internal Menu setting that deactivates the rear panel  
PTT IN jack?
 
Sure would like to get my foot switch once  again.
 
Thanks,
 
Dick- K9OM