frrobert,
Two important details stick out. In your first post:
My first issue was the volts/div knobs were not working correctly.
The pattern of affected ranges does not align with the steps between the attenuators. Point to consider: .005 is affected, while .01 and .02 are not. All three ranges share a single 100 Ohm resistor (R1201) straight through without attenuation. The only thing that changes between these three ranges is the mechanical position of the switch. Electrically, there is zero difference. The gain change is accomplished via the third section (S1203-3) in the middle of the schematic.
Also in your first post:
I got into the scope cleaned the switches with contact cleaner and they are working much better.
Given that the range switches were the initial problem, the data-points available so far imply the range switches are still suspect.
Please post a photo of the product used to clean the switches. Some contact cleaners just aren't effective.
As it will be necessary to open the scope for some troubleshooting, a few clear closeup photos of the range switches will be helpful.
First troubleshooting step should be to measure resistance from the channel 1 BNC center pin to the output side of the range switch. The output will be the wire that connects the range switch to the pcb, the junction of R1208 and C1205.
Make certain the AC/DC switch is set to DC and the GND switch is not set to the GND position. Measure the resistance with the range switch set to .005, .01 and .02. Each range should measure exactly the same, within 5% of 100 Ohms.
Repeat this same test for channel 2.
Post back with the measurement results and photos, once you have the time to do so.
RF+ Tech