hi bill,
on mine the door was coming off when you tried to close it. the upper tube that the rollers were on was bent down about 1/2" that caused the door to dip and then come off on the bottom. the tube itself wasnt bent, just the connectors on each end of it were. i took it apart and bent the connectors on each end back straight (carefully) and put it back together and it is just fine.
tom
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