Clutches are a constant source of aggravation!, you generally can't tell visually if a clutch disc's materiel has been over heated and could be crystalized? Pressure plate and flywheel faces that show "bluing" from being overheated are usually a clue. Overheating can heat up and ruin the Marcel spring in the disc or the diaphragm spring in the pressure plate and cause weakened clamping pressure and or warping the pressure plate.****** But what it really comes down to is that the cost of these components is ~1/3 or less of the total repair bill! Meaning IF after reassembly, IF any of these pieces proves unsatisfactory the labor is doubled and the component $$ savings is lost! The shop is doing the total clutch job again and with new parts $$ this time! IF the labor is all yours, go for it!, but I'd probably still, at least!, use a new T/O bearing!