An engine is disassembled after low miles and a recent overhaul because of smoking. during the engine disassembly, it is noticed that many of the crankshaft bearings have localized (in one area of each bearing) spots of wear. Technician A says that this is a normal condition for an overhauled engine. Technician B says the localized wear could be due to dirt that was left on the main bearing saddles during the recent overhaul. Who is correct?