[Elecraft] K2 No Receive on 40 Meters

[KM4VX]

 My K2/10 (#6255) has suddenly lost any receive capability on 40 meters. It
transmits on all bands including 40 meters but hears nothing on 40. I have
done the simple checks in changing coax and antenna inputs with no change. I
have a second K2 for comparison, but lacking any lab equipment here am
unable to identify the problem. I don't recall ever accidently transmitting
into the rig on 40 when using another radio. Any input from the group would
be appreciated. There is no receive on 40 in any mode, just the same low
noise throughout the band. The noise level does increase when the preamp is
on, but still no receive. It works fine on al other bands. Thanks Ron
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