Hi there, I hope you found the problem but if not, here are some sugestions.

First (forgive me) I must say that it seems unreasonable to blame the valet or the restaurant. Cars break down, parts malfunction and break/screw up all the time. If he/she stomped on the remote or phisicaly broke the door handle with excessive force etc you could blame him/her but withought phisical damage present, I think you should concentrate on finding and fixing the problem. I have been in your situation and later felt embarassed, thats why I'm sharing this with you.

From your description of the problem, I think it is either the passenger side door handle (lock switch) causing the problem, or a break in the (green?) wire that goes from that door handle all the way to the round plug connector on the vac pump.

The lock switch in the door handle sends a 12 volt signal to unlock, or a ground signal to lock, when the key is turned.

Check the green wire at the round connector at the vac pump with a 12 volt test light or a volt meter, in fact check all three wires one at a time while both locking and unlocking the doors from the right and left doors as well as the trunk.

If you don't get both 12 volts, then ground, when locking and unlocking, that line is your problem, trace it back to the door handle. It should be either a break in the wire (possibly in the door jamb) or a faulty door lock swicth.

As for the remote, It may work as it did once you find and fix the problem.

Hope this helps,

Acky