Can’t help exactly but had this problem on a car and used a long nozzle on tin of W D 40 with a rag to hand and reached in around all I could get at where movement occurred and sprayed using rag to wipe off surplus, had to do this daily for a few days and eventually it did help , not a total cure but helped , I even tapped surrounding covering with palm of my hand as I done it , mine sounded like plastic to plastic. Sorry can’t help further.