Guess I missed some of the posts after a major move and no internet access -
Hopefully they got their controllers back up in the end.
I suspect when controller was taken apart, the ribbon cable with exposed contacts is not pressing against mating contacts with enough pressure. I did make a cushion to assist this contact pressure a little more, and it's working great.
Fortunately my controller is still going strong, but I did modify trigger silicone pads that end up a little damaged and don't output 100% when tested on laptop and the app that shows triggers in real time.
The mod worked quite well where I should have just ordered new silicone pads, but just couldn't wait to get back to Racing on GTSport.
If someone would like to see detail on trigger mod, I do have images on file. The key is the trigger where the bar that makes contact to silicone pad has sunken into and has worn down into pad
where a sleeve was made to slip over trigger bar to make slightly bigger footprint on silicone pad.
Sleeve was cut from plastic QTip, and cuts made in sleeve to slip over the bar. Nothing more was needed, assemble and ready to go.
The hard part, getting sleeve that's very small to handle, then inserted in place. Pretty sure tweezers were needed.
Cheers