As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CIRCLING TO LAND AT UMST, THE MASTER CAUTION AND HYDRAULIC LIGHT ILLUMINATED. NR 1 AND NR 2 PRESSURE AND TEMP WERE WITHIN LIMITS. EMERGENCY CHECKLIST USED AND PILOT DIVERTED TO MARTIN STATE AIRPORT. MAINTENANCE CLEANED CANNON PLUG CONNECTORS TO THE NR 1 AND NR 2 HYDRAULIC SYSTEM PRESSURE AND TEMP. SWITCHES. SYSTEMS CHECKED OK.