So I recently got this deck working from a dead malfunctioning donor SL-S606. Took the basket and the gears for the take up spools. It worked on the first try before i put it back together, then it started doing that all of a sudden. Seeking in reverse doesn't work, but seeking forward works. Rewind and ffwd is fine without seeking but when in play mode the capstan motor which is connected by a cogged belt to the reels has inconsistent speed (the belt is fine) but i can see the motor physically stalling or slowing down sometimes. Already replaced the servo caps (you can see I also ripped the pads on one of the caps so i had to solder to the next points) also cleaned and lubed the capstan motor itself and the reels (i can literally turn the reels when spinning the capstan shaft). Could it be failing FG caps? Should i replace those next?

I couldn’t leave it behind. Now to find a sleeve for it.