L-100 Reverb Troubleshooting

[Greeny]

Hey guys, I am having trouble getting my spring reverb to work on my L-100.
I'm using the internal speakers which sound good in my opinion.
Unfortunately whenever I have the Reverb tabs enabled, they no longer produce the Echo effect anymore.
The Volume Soft & Brilliance tabs are still working.
I've tried bumping the reverb springs while the organ was powered ON and they were able to produce sound on all 3 combinations of Reverb.
I've also checked for any microphonic tubes, none of which produced sound.
All of the tubes seem to be glowing correctly as they should.

Here's a small list of the stuff I cleaned out
• Oxidation on All RCA Jacks/Outputs
• All Tube Pins/Sockets
• All Control Tab Rods

Since the problem lies within the main power amplifier, which electrical components should I replace for the reverb to work normally again?

[Drawbar Dave]

I had to troubleshoot the same issue for a forum member back in the summer. In his case the problem related to the electrolytic capacitor in the reverb circuit, C303 according to my notes. I used a modern radial capacitor mounted under the chassis.