Scuba Cylinders:
Air/Nitrox/Oxygen/Helium Fills
Visual Inspections (Annually)
Hydrostatic Tests (Every 5 years)
O2 Cleaning
Valve Repair and Rebuilds
(Cylinder Guidelines Link)
Regulators:
Annual Inspection
System overhaul (Includes cleaning and parts replacement)
BCD (Buoyancy Compensation Device):
Annual Inspection
Cleaning and Part Replacement (As needed)
Computers:
Battery Inspection and Change (As needed)
If necessary, replacement of hose, O-ring, and/or parts
Drysuit and Wetsuit:
Neck and Wrist Seal Replacements
Neoprene and trilaminate