Ok, it appears that the bnc jack on the channel 1 attenuators is bad. The connection to the probe ring was loose and intermittent. The bnc jacks alone are not available for any reasonable price, so I picked up another attenuator.
Btw, the component numbers you referred to were for the 2465b. My 2465 has the same circuit with different component numbers.
Thanks again for the pointers.
Greg
