As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3712 -HYD- DECLARED EMERGENCY DUE TO 'A' SYSTEM HYDRAULIC LOW-PRESSURE LIGHT ILLUMINATED. CORRECTIVE ACTION: REPLACED #1 ENGINE DRIVEN HYDRAULIC PUMP PER B737 AMM. REMOVED AND REPLACED EMPD AND EDP CASE DRAIN FILTERS. REPLACED PRESSURE MODULE AND RETURN MODULE FILTERS. NO EVIDENCE OF METAL CONTAMINATION. PERFORMED DRY MOTOR AND ENGINE RUNS. NO LEAKS FOUND. OPS CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.