Problem: Elevator does not work for the top floor (#3). It goes there and becomes effectively "stuck".

Elevator works well for floors #1 and #2.

Elevator description:
* 3 floor residential elevator, hydraulic cylinder/cable lift
* Installed May 2004, Job 400462
* Concord "Infinity" Model with "Virginia" control, Made in Canada.
* Main control Board: PN 772320 Rev 000
* Hoistway junction board (version kwiklock): 772319 Rev 000 - appears to have four floor capability, wires are connected to #1,#2, and #3. #4 unused (has a couple of jumpered connectors).
* Car Station Junction board: PN 772318 Rev 002
* Sensors
- Each floor has one limit switch, connects to hoistway junction board. I assume this indicates that the car reached a particular floor.
- Bottom and top floor have an overtravel device that trips three limit switch on the car.
- Each floor has magnets on steel ribbon. Interface Products, Product: LCS, Model IP8300, LEDs: IPF,LU,LD,DZ,2FP,4FP. (for a graceful stop at each floor).
- Each floor has a kwiklock door control.
- Inside the car, there are three floor buttons and a display showing the floor number.

Here's what I see.
1) When the car arrives at the third floor, the floor 3 limit switch is "made" but seems to have no effect. The car stops when the car's "overtravel" limit switch is made. The car is an inch or two "too high" relative to the floor.
2) Unlike the other floors, the door does not unlock.
3) Inside the car (after that), "1" is displayed on the panel (it should display "3").
4) On the car junction board, there are LEDs labeled 1S, 2S, 4S. 1S is ON when the car is at the first floor. 2S is ON at the second floor. But, when at the third floor, LED 1S is ON again! I would think it would be 3S but there is no 3S LED so I suspect that 4S should be ON.
5) You are effectively stuck at the third floor. The door is locked. The car pushbuttons do not cause it to go to the 2nd or 1st floor.
6) To get the elevator working again, I manually lower the car to a position between floors, then call it downward. Then, it works again for floors 1 and 2.

I checked the 3rd floor limit switch - it is fine at the switch itself. I don't see any corrosion or wiring issues back to the hoistway junction board. It plugs into connector T15, labeled "Zone Sw".

What can you recommend for me? Thank you for reading this far.