{Collins} KWM-2 problems. No S meter on receive

I am still trying to get this nice old KWM-2 running properly and it is "stumping" me.  Now after getting the transmitter back strong  on all bands and doing a "field alignment" I have no S-meter on receive(works fine on transmit) and the receiver could be stronger.  Any quick and easy tips would be greatly appreciated again.  Tom AB8BW
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