Mesa Tremoverb EQ change when using reverb

[MstrB]

I thought this had been discussed before but cannot find the thread. I recall a Tremoverb which a customer brought in with the complaint that its eq changed when he turned on the reverb. Found a capacitor had been added to the circuit at the factory to drain parasitic oscillation. It appears the layout had created the problem and the factory added the cap as a bandaid. Anyone else remember something like this? Do they still have this problem?