seat back locks?
 

i have a vac leak in the drivers seat. i took the seat out of the car so i could trouble shoot it easier. the right side vac valve is leaking. this looks difficult to remove and install, especially as the screw heads are facing upward and are not visible. there must be an easier way, i just haven't figured it out. in the mean time i blocked the vac line going to the right valve. i would appreciate any insight, thanks.

I think somebody posted here that there's available a repair kit for the rubber diaphragms.

One of mine is busted too so I just blocked that line so i don't have a leak.