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I had a same problem last late winter. There was one plastic gear part cracking in the opener which is rolling to drag the steel rope to open the door. I was told the door bottom is frozen with floor by melting water on the floor. When you tired to open the door, the drag force is very very strong. Plus, the plastic part is crispy and weal with the lower temperature. That causes the cracking or broken.
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6 |; o- @8 S6 {6 x2 R3 qThe service guy changed the broken part, but the special plastic cover is still broken. I have to use 502 glue to fix it. With time, it will break again and then i have to change the whole opener. & E4 \' [8 \7 o" B3 T
; R" k( Y, F2 S2 w# n) I# g2 k7 gIn my case with part change and labor, i paid $200. ! T9 \" e" K! D, R
' C1 n9 K+ G. h8 |$ `1 N% ^; jgood luck |
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