Followed customer concerns. exhaust hood system was not pulling air out. went up to the roof. found 2nd exhaust from the hatch with belt broken in pieces. tried to put spare belt on. found drive and blower pulleys not lined up. I adjusted motor pulley. also belt was very tight. I adjusted the motor. unit is working properly at this time. also customer wanted me to check the other exhaust fans. I found all belts torn. and I replaced them with spare belts. belts check is due on April PM. we will bring 5 spare belts. all good at this time.