Vesta Fire D-1x - gut shot / wiring detail needed

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In my trawling for busted pedals I've come across a rare Vesta Fire D-1x delay pedal. It's a dual pedal, 12-bit delay like this. Functionally, similar to the well-known Digitech PDS series. It's this one: https://www.effectsdatabase.com/model/vestafire/double/d1x

The unit appears to power up and take signal just fine, passes bypass signal nicely, but the switching is non-functional. The unit's big, plastic  buttons are cracked, so I opened it up to see if I could access the tact switches that I assumed to be positioned underneath these. What I discovered is that someone severed the leads going from the two tact switches to one of the two PCB's. I found four wiring pads that are unpopulated, but don't know which wire goes to which. I'm curious to try various combinations until I arrive at a solution, but if anyone has one of these and can help me identify where to hook up the switches, I'm incredibly grateful!

I have a person near me who can do 3d printing at reasonable prices so I'm thinking if I can confirm switching works generally, I'll get the big plastic push buttons replicated and re-made! I recently had a missing cassette door panel on my cherished Nakamichi 600 cassette deck done this way - miracles of modern technology.

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