I'm with you, Hetty. A combination of coolness and lack of strong light, and the very fact that it would be in a semi-dormant state, causes the plant to need very little water and really, no fertilizer. If it has never been re-potted, I have a feeling that the soil is long-past its usefulness and the root-ball will likely be a combination of struggling roots and rotted ones. The plant could certainly be root-bound.
Do as Hetty suggested. Re-pot immediately and with well draining potting soil. If you can do so, make your own potting soil by using 1/2 commercial potting soil (Miracle Gro for example), 1/4 coarse perlite, and 1/4 orchid potting media. Also, be sure you empty the catch-saucer of water after each watering. Water lightly after re-potting, keep in bright light and with temperature around 70 F, and don't water again until the top 2 " of soil is dry. Personally, when I get someone's sick/dying plant, I don't re-water until I see evidence of growth. If the roots are in such bad shape as I fear they are, they can't utilize water anyway. New growth or the evidence of leaf revival will indicate that the roots are functional again.
Good Luck.
