Thanks for the info everyone. First off, it was cleaned professionally
so that one is out. And yes, I confused condensor with
compresser...brain fart...the compresser continually runs but cooling
drops over time.

As for the condo question, the valves are open (double checked that
one, and it does cool initially ).

With the age of it I'm thinking it might need replacing. Partially
because it's a b***h to work on due to it's design (and the fact it's
jammed in a space barely big enough for it, let alone my sweaty paws)
and the contractors says that it'll be minimum $800 to fix it. $800 on
a 15 year old unit doesn't seem like a wise move.

Thanks again for the advice.