it is not so much in the temperature of the record, records warp when one side is hotter than the other (try this: take a warped record and put the convex side(dome side) up to a lamp for about 30 sec, then spin it, it will fix your problem, but only for a while until that side cools again) this is because vinyl has memory, one of the many wonderful characteristics of plastic, so in order to fix a warped record you must break and reform the plastic bonds and i doubt anyone will be able to do this without adversely effecting the quality of the record. reshaping the vinyl will reshape the groove as well and i would not advice doing that. my theory is that warping is due to poor pressing techniques, when the record is molded one side is allowed to cool faster than the other and it results in a bell shaped record, pesrsonally i would not try any of the "warp-fixes" that are out there.