Steel garage doors are the most difficult to repair because they are also the most durable and do not damage easily. They have the longest warranties and are stronger than all-wood doors. Some even have added strength due to foam insulation and require very little up-keep. They also have durable windows, finishes and designs. Similarly, fiberglass garage doors are very difficult to repair because they do not dent easily and are very strong and durable.
The doors that get stuck in the open position come in third as the most difficult to repair. They can still be closed manually, but the tracks and rollers must be checked by a garage door repair Denver professional. Moreover, blockages can be very difficult to deal with if the sensors are the ones stopping the door from shutting. If the photo eye sensors malfunction, then they simply have to be replaced and can no longer be repaired.
Moreover, there are certain brands that are more difficult to repair than others. For instance, Chamberlain garage doors are infamous for being very challenging in terms of fixing, which is why it takes an expert to repair them once the damage is done.
There are also certain types of damages that are more challenging than others including: poorly performed repair jobs, misguided DIY fiddling and complete lack of up-keep.