Safety: Garage doors are heavy and spring/cable systems can be under significant tension. Do not loosen or disassemble high-tension hardware unless you are qualified to do so.
What Maintenance Can Cover
A service visit may include inspection of rollers, hinges, tracks, cables, springs, fasteners, seals, opener operation, and safety features as appropriate.
Listen and Watch
New noises, vibration, slow travel, uneven movement, or repeated reversing are useful signs to investigate rather than ignore.
Know the Limits of DIY Maintenance
Basic cleaning and observation are different from adjusting springs, cables, or other tensioned hardware.