Seal changes are pretty easy, but I'm not sure what the spares availability is for Shimano brakes to the end consumer. As far as i can remember shops can get service kits but I don't think they're sold to you and I, unlike other brands where you can buy every little bit.
Have the disc tabs been faced?
I still think it'd be worth getting the linkages checked out because it sounds like the issue is only when under load. Do Marin still offer lifetime warranties on their bearings?
Have the disc tabs been faced?
I still think it'd be worth getting the linkages checked out because it sounds like the issue is only when under load. Do Marin still offer lifetime warranties on their bearings?