safetypee
I hope that you use the right grease and only put it on the bearing and not all over the track !!
Capt Claret.
I could be wrong but I thought that they were only fitted to 200/300 (and not all as per a/c effectivity)(some mil spec units are also optioned but data is hard to obtain)
Another noise area is pylon track boat vib's (ribs 6,10 mainly)with any flap selection.
Arrh!! the moanful groan of two hydraulic systems (through planetary gears)trying to move universal equiped driveshafts to gearboxes which drives chains(read Malvern Star)to an intermeadiate drive (primary or secondry)screwjack (again watch what grease you use as it has a habit of freezing up giving erroneous flap fault warnings) brings a chuckle to mind.
Have a nice day !!