My Profurl is 28yo, Observed it once, in my opinion if you think its the bearings. Bearings can be taken off insitu, but may need specialist to disassemble from housing.
Method that worked for me.
Sail removed. Mast
tensioned forward by other halyard
The lower aluminium foil must be suported by another halyard
Note position of screws on turnbuckle for restoration
Remove the drum, 4 captive screws. and 3 grub screws to the lower foil extrusion, careful of these screw, one grub is a special shape.
The two side plates may need to be removed, to access the turnbuckle to ease the tension on forstay. Possible problem with upper cap screws also special (mine were seized), that go thru the lower aluminium bearing housing, just below the drum.
Foil sag may be a issue, I tensioned it down via the anchor
roller and a winch
on the mast
. This will help assembly as well. Restrain assembly forwards by another rope
as you have to let the down tension go, both bearing assemblies can go past the turn buckle.
My bearings were fine, but a neighbour had to send his bearing assembly away.
Rigger working with me did something up top, don't know what, perhaps the upper tube has a support.
Thats it, but if you haven't found problem, any further work on foretay the forestay and extrusion assembly has to come down to dissasemble, (that job requires care) and check the carbons that run on the SS forestay, a pair of carbons per section, I only replaced the lower pair of carbons and because this is accsessible, I was able to do it insitu.