37 Installation and repair of freezing equipment; Class 3701: Provide maintenance informationClass 3705: Installation and repair of heating equipment3706 (1) Repair or maintenance of semiconductor manufacturing machines and systems; Mechanical installation, maintenance and repair; Repair worn or partially damaged machines; Repair worn or partially damaged engines; Installation and repair of computer hardware; Repair or maintenance of IC manufacturing machines and devices3707/3708/3709: Vehicle failure repair service