What was found
DURING DESCENT THROUGH FL 190 OIL PRESSURE LOW ANNUNCIATOR ON AMD OIL PRESSURE DROPPING BELOW 35 PSI, FOLLOWED EQRH EFFECTED ENGINE (NR 1). REPLACED NR 4 BEARING OIL SUPPLY LINE IAW AMM 79-20-00 LEAKED CHECKED LINE, NO LEAKS NOTED, AIRCRAFT GOOD FOR SERVICE.