As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS GAUGE IS PART OF STC SA 4378WP AVIADESIGN, INC., HYDRAULIC LANDING GEAR RETRACTION SYSTEM. WITH ZERO PRESSURE IN ACCUMULATOR, THIS GAUGE WAS STILL SHOWING 500 P.S.I.G. FOR INDICATION. SUBMITTER RECOMMENDED A BETTER QUALITY GAUGE BE USED IN SYSTEM.