I'm sorry I haven't written more sooner. It has been behaving again, so there isn't much to see.
I took off the clear bin and looked up into the cone while working the flap release. It seems to be working. When you pull up on the release trigger, the clasp swings to the side and the bar pushes down. When you release the trigger, the bar retracts and the clasp swings back into place.
When you look at the main unit there does not seem to be any real damage. There are some minor scratches, but they aren't where the bin sits (think trying to vacuum under furniture and such).
I had thought about the gaskets that are behind the bin but they seem intact and when you watch it fail they do not seem likely.
I also checked the bin flap which shows no signs of any damage. I was wondering if the bin flap gasket should be replaced. It seems a bit worn and thin but not actually damaged, so I doubt that it could be the problem.
I also checked the thumb latch to remove the assembly from the upright. It moves up and down freely with no visible damage to it either.
As soon as it acts up again, I will look at everything again. I'll also try to get pics and/or vid.