When I look to get any work done on my rib I will always go to "Seadog" in Leith, they been bought over by Colsalt and had the same friendly staff.
They might help out.... Albert Place , Leith. they move from the Leith docks are now on the way out of Leith.
Unfortunately they took there old address to the new building!
You could always give them a clean your self with Polymarine Rib cleaner and then the Rib finisher , Y-10 for your HULL a few hours you got new looking tubes.
The other place i would recommend is Davey Anderson Marine - Newport on Tay.....