Canadair RJ
My friend is an apprentice avionics engineer at Air Canada. He says the RJ is a pretty good airplane but mentioned one weak spot - the passenger door. I understand it's a two piece folding type and the internal electrical wiring wears excessively because of the bending every time the door is opend and closed. He says it takes a couple of hours to take it apart as there are lots of screws. Hope this is of interest and I'll try and get more info next time I see him.