Good odds on the landing gear not retracting.....theres a flap above the F/Os head that is used to lower rthe main gear rear doors for maintenance and daily checks. There is no mention of this in the checklist for gear problems. If left down, it disables the gear.
Many Dashes have had embarassed crews pull up on stand and have the flap pointed out to them by engineers........
Engine failures also happen once in a while.
No ice about was there?