As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT THROUGH LANDING, RETURN AND TAXI MASTER CAUTION WITH FLIGHT CONTROL ANNUNCIATION ILLUMINATED REPEATEDLY. FOUND STANDBY HYDRAULIC SYSTEM LOW, QUALITY LIGHT CAUSING MASTER CAUTION. CHECKED WIRING AND RESEATED CONNECTOR D46020 AND REPLACED L4 MODULE IN LOW QUALITY LIGHT ASSEMBLY SYSTEM NOW CHECKS NORMAL OK FOR SERVICE.