[Elecraft]KAT2 not switching antennas after precipitation static event

[Arthur Gunn]

Initially this KAT2 worked well, switching between ant1 & ant2. During  
a lighthouse portable weekend, in hard driving rain, it may have  
suffered from a precipitation static discharge via the connected  
antenna. Since then, ant2 is always connected. The K-2 (#6155)  
otherwise operates normally.

Believing that relay K18 may have had contacts damaged, it has been  
replaced but with no change in operation.

Operating the switch for ant1 to ant2 results in a relay operation  
sound. Measuring the contacts confirms that the K-18 does not change  
position. The tune function operates normally.

In troubleshooting, the DMM indicates the K-18 coil pin 10 to ant  
connector shell ground reads 208 ohms while the same reading for K-17  
shows 24 ohms.

While tuning the connected antenna: K-18 coil pin 10 to pin 1 reads a  
transient 200 mV and K-17 similar reading is a transient 10 mV. The  
two relay coils measure about 245 ohms each.

Should I assume that U1 is failing to provide the signal to K-18 and  
the relay sound is from another relay possibly also due to U-1 fault?

Your thoughts are appreciated.

Arthur VE9BP