Report "3 door freezer unit similar to 2030FE, but older, with a copeland compressor has problem staying below freezing after doors are opened for short periods (1-2 minutes) repeatedly. have gotten temp down to -10, but 1 door was opened twice 2 minutes apart and for no longer than 2 minutes and temp jumped to 59 degrees and took hours to get back to freezing temps. what direction should i go with this?"