As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW NOTED A-SYSTEM OVERHEAT LIGHT FLICKERING. AIRCRAFT RETURNED TO OAK AND MADE AN UNEVENTFUL LANDING. REMOVED AND REPLACED OVERHEAD P5 PANEL AND SYSTEM PRESSURE SWITCH. INSPECTED BOTH CASE DRAIN FILTERS AND WIRING, ALL CHECKED OK PER BOEING M/M.