As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 HYDRAULIC ISOLATION VALVE ILLUMINATED AFTER TAKEOFF. ALL HYD PRESSURES AND QUANTITIES INDICATED NORMAL. NO OTHER LOSS OF SYSTEMS. AFTER GEAR WAS EXTENDED, NR 2 HYD ISOLATION VALVE FLICKERED INTERMITTENTLY DURING LANDING. R & R NR 2 HYD ISOLATION VALVE OUTPUT PRESSURE SWITCH IAW AMM 29-30-11-000-801, 29-30-11-400-801. LEAK CHECKED GOOD. PRESSURIZED NR 2 HYD SYSTEM AND CAUTION LIGHT DID NOT ILLUMINATE OR FLICKER. RETURNED TO SERVICE.