I have a '95 Altima with power locks, and front passenger door lock will NOT un-lock. Each time I try (using button), all other doors will unlock except front passenger door. When I try to do it manually with the key, it still will not unlock. Or by hand from the inside, it will only go so far, but will not allow the door to open. I can disengage the lock by any means.

Can anyone refer me to info on fixing this issue, please?

 

Best guess would be that you've had a portion of the linkage either break of come loose and it is binding. About all you can do is get the inner door panel off and investigate; easier said than done because getting the panel off without opening the door will be a real project. Sorry I can't be of more help; this is probably one for your favorite mechanic.