[Elecraft] K3 button problem question

[Paul Ferguson]

Seven of my front panel buttons do not function on K3 #757. I also used the 
Switch Test to see that they give no scan codes. All other buttons work OK.

Looking at the the schematic for the "Front Panel - Switches" I see these seven 
buttons are all connected to the SCANADC0 line into U3. I took off the front 
panel and put an ohmmeter from ground to the SCANADC0 line, and it gives a few 
ohms. The other lines (SCANADC1-7) show as open.

I looks like either U3, C30, or R27 is bad. Does anyone see any other 
possibilities?

I don't relish replacing U3 since it is a 16-pin IC. Maybe some Chip-Quik or 
tiny cutters to snip the leads would ease the job.

73,
Paul
K5ESW