Dunno 🤷♂️. I haven’t had one in yet. I’d guess a pad set with a decent booster alone costs $200-$250. The 60mm pads are now like $9 ea. Add a booster and they’re over $10. Probably three sticks of shellac, bla,bla bla and you’re over $300 in just parts & materials. Labor time ? In good condition, no damage work / overhaul required. I would guess 15-20 hours minimum. @$50/hr that’s a grand. ( Shops around here charge $85/hr for student repairs).
The biggest problem I see is finding a technician that can & will work on one.