GE washer stack unit the customer says that it is squeaking “squealing” she says it was intermittent .

I believe you are missing the “D” in your model number.
If it’s the dryer then it’s quite possibly the rear bearing. We find it a practice to change the front bearing (just the top piece) and the belt because of the extra strain a bad rear bearing puts on them. You can use the Frigidaire parts because the rear bearing comes with the whole kit. This is 5303281153 rear bearing. 5303937139 front bearing. 137292700 belt.
If it’s the washer, well then, your customer may slightly smell burnt rubber. It should be just change the belt.WH07X10009. I would try looking for a video at ApplianceVideo.com. Here is the link https://www.appliancevideo.com/
Just type in your symptom and look for a free video.