[Elecraft] K2-- Auto Tuner Issue

[KM4VX]

My AT has suddenly started showing "LO PO" after displaying the SWR on all
bands when the TUNE button is pressed. I have the AT set to "AUTO" and even
when manually increasing the power I still get the "LO PO" display after the
K2 displays the SWR. Changing antennas has no effect. Ths is K2 serial
number 6255 which otherwise seems to be working fine. Welcome any ideas.
Thanks.
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