[Elecraft] K3: Rx dead, need help. More details

[DM4iM]

The K3 shows no reaction on changing the volume or rf-gain, but it shows
reaction on changing the bandwidth etc. I can hear a test signal from a
transmitter, with no antenna connected to the K3. The signal i hear does
not change when increasing power, no s-meter deflection. So i assume the
rx itself is ok, but the received signal is not amplified by the stages
after the rx.
Also, the K3 fails to transmit.

Any comments?

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73, DM4iM
K2 #2706