We bought this new around 1994 and it's never given us any trouble. Within the past 2 weeks we discovered it's leaking water and collecting under the crisper, then leaking out the front of the fridge. I did a search and I believe a drain tube is frozen or clogged but can't figure out where it is or how to get to it! I took the cover off the temp controls in the Refrigerator section and confirmed that's where the water is coming from. Please help! Also - there's an adjustment screw on those controls that had a plastic plug covering it up but it's not labeled, can someone tell me what that's for? I really can't afford a service call right now and this sounds like such an easy fix. Thanks alot for any help in advance.