1980s Vox Venue Lead 100 maintenance

Hi all, I picked up the 1908s Vox Venue 100 Lead very cheap, which has been working. Changed the power switch as the old one blew (it took out the small fuse at the mains plug so am hoping nothing else got "fried"). I notice one of the upright mid-size caps on the "first" board (the one that has the vol, tone etc. pots attached) seems loose, and is causing the classic "dry solder" popping & crackling, a fairly simple resolder fix once the board is out. Also, at the time I'll replace one or two pots as they're not responding to pot cleaner, with noisy rumbling. I have a basic hand drawn schematic from Vox but wondered if anyone has knowledge of a better one. Also, the reverb is very week, it has a dual spring built in but I'm not sure how to trace the signal amount going in and coming out, any advice would be appreciated. I thought a stronger signal sent to the reverb section by changing the resistor/diode might achieve this?

Many thanks in advance, Mark from Sydney, Australia.
 
Check the leads to the reverb pan.
This pre amp schematic, may help;
 

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