Roland TR-606 snare stopped making sound

Hi there,

First time posting.

I lent my TR-606 to friend for a few months. Now I have it back and everything works except that the snare sound is no longer coming out of the main or headphone output. This is a vintage 606 that was modded with individual outs (not by me). If I plug into the snare output I do get the ever-so-slightest sound of the snare, but it’s very faint.

Anyone have any thoughts- maybe a dislodged internal connection?
Any help would be super appreciated, as I need this thing to work for a gig at the end of January.