What was found
ALERTING DUCT PRESSURE LOW FOR NR 1 ENG. ON DESCENT. PRESSURE CONSISTENT AT 8 PSI VS 35 PSI. DURING INSPECTION OF SENSE LINES AND FITTINGS, FOUND SHORT ELBOW SENSE LINE ON THE SUPPLY PRESSURE SENSE LINE OF THE BLEED AIR REGULATOR BROKEN & SEVERED. CHECKED & ENSURED SMOOTH TRAVEL OF PRSOV BUTTERFLY VALVE AND PCCV. INSTALLED A NEW ELBOW SENSE LINE ON THE SUPPLY PRESSURE SENSE LINE OF BLEED AIR REGULATOR IAW AMM 36-11-03. LEAK CHECKED GOOD. PERFORMED HIGH POWER RUN TO CONFIRM PROPER DUCT PRESSURE. OPS CHECKS PASSED IAW AMM 36-11-00-710-801.