[Elecraft] [K3] S/N 45## low power out and ATU not tuning properly?

[Nr4c]

This started several years ago at a FD. Brought home and worked perfectly.  took to another outdoor event and same thing. Works at home not at events. 

Pulled KPA3 out and applied Deoxit and worked connectors in/out several times and replaced KPA3. Worked well thru two FDs and number of other events.  And as main radio after selling my K3S last summer ($ for K4D). Took down and packed it up for FD about 6 weeks ago and replaced it with an IC-7300 till the K4 arrives. 

This AM it started again at FD!  

Could this be an LPA issue instead of the KPA3 issue?  Can’t remember if my KPA3 has gold pins or not. 

Help!

Sent from my iPhone
...nr4c. Bill