[Elecraft] K3 Uh-oh... won't turn off

[Drew AF2Z]

My K3 turns on whenever power is connected, without pushing the power 
button. When I push the power button to shut down the display clears but 
remains lit-- just a blank amber display. Can only turn on again by 
recycling the power supply; the K3 Power button has no effect. Otherwise 
the rig seems to operate normally.

I reloaded the firmware and config settings but that didn't help.

This occurred  after I replaced the FP plugs with the gold plated ones. 
I replaced the PA plugs about a week ago. All plugs are mated/seated 
correctly; good solder job.

Any ideas?

73,
Drew
AF2Z