What was found
EMERGENCY DECLARED - IN FLIGHT LOST LEFT SYSTEM HYDRAULIC FLUID; LEFT ENG AND ELEC HYDRAULIC PUMP PRESSURE LIGHTS ILLUMINATED. **SUPPLEMENTAL SDR**FOUND LEFT ENGINE CASE DRAIN FILTER DPI SWITCH FAILED AND CAUSING LEAK. R&R DPI PER AMM 29-11-17-004. AS PRECAUTION REMOVED, INSPECTED AND REPLACED LEFT ENGINE PRESSURE & CASE DRAIN FILTERS PER AMM 29-11-17. NO CONTAMINATION FOUND. SERVICED HYDRAULICS PER AMM 12-12-01. LEAK CHECKS GOOD.