[Elecraft] Power output from KVX3

[Merv Schweigert]

I have been using the output on the KVX3 on the 475khz band
and it has worked great,  can adjust it from .1 to 1.5mw,  I have
been running it at .4mw driving an amplifier,
This morning I noticed that the power control no longer adjusts
the power output,   no matter the setting, its at some unknown
power,  maybe full power?  but I cannot change the output any
longer,
Any ideas if there is something I could have changed or perhaps the KVX3
has gone south?

Thanks 73 Merv K9FD/KH6