Great to hear you were able to unlock it without using my suggested surgery. Hope you gave your son a big "addaboy."

Regarding A. Rosich's post of

[1] removing "the rear side AND rear floor panels."
Does anyone know how to remove these panels when the seat is in the up position?

And

[2] "there is a weak link or latch from the system that gets loose and the safety pin on the door post cannot unlock the backrest properly. "
Does anyone know of a preventive fix? Or is Merkey's "put a nut on it... so it wont come off again" the best?

Bob