Proximity Sensor DOES NOT WORK after Power Button Repair

First time I've had this issue. Customer brought in an iPhone 4 and the proximity sensor was not working. I noticed the power button flex cable was replaced and they did not transfer the black square rubber piece from the old one. So I replaced the cable and put the black piece but the sensor still didn't work. I tried the "black tape" trick even though his screen was original and STILL does not work.

What could it possibly be?

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