We have a door purchased from Marvin in 1997. The lock, a multi-locking system made by "Truth," is for a swinging patio door. It will no longer open, and I believe the little thumb turn or whatever it's called does not turn - or maybe just spins. We would prefer to not get a whole new door but are stumped as to get this one fixed. My husband called Marvin and was told they don't repair this door any more. Does anyone have any advice, other than calling a locksmith to see if he/she thinks it can be repaired/replaced?