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with a 10V sine wave with a 10x probe
If I decrease the voltage to 5V and use the 50ohm button and a 1X probe It will trigger on all settings.
Have you a Service manual?Plenty of links to find one here:https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/msg477909/#msg477909
I hooked an ohm meter to the output the working channel shows the correct 1Mohm through all divisions. Non working channel shows 1Mohm on divisions 5V-.1V then 0ohms in the 5-50mV. 50ohm setting shows 50ohm through all divisions on both channels and is working properly.
Figured it out it was a broken contact on the hi-z board. the plastic had cracked allowing the contact to float around.