I've only ever seen replacement motherboards for the EQ6-R. Not the optical indexer (which is the board you broke).
This guy says he disconnected the indexer cable and got more or less the same guiding... some guy in the comments says it's only important if you use PEC.
https://www.cloudynights.com/topic/559399-worm-gear-indexer-important/This teardown shows the intact indexer. Looks like you ripped off a port. Control+F for "indexer"
https://stargazerslounge.com/topic/382291-eq6-r-pro-teardown/Not to self-plug super hard, but if you can't find a replacement indexer board and you aren't OK with just going without the indexer, I can repair it. Though I'd probably need to charge ~$120 + shipping just because I doubt I can find an exact replacement for the port you broke, so I'd need to solder jumper wires onto those traces and then splice them into the cable that plugs into that board.
But hopefully you can go without repairing it if you don't care about PEC.
EDIT: Oh! Someone found the replacement board in the time it took me to write this comment. Nice.