What was found
STL - FLT 658 - DURING CLIMB, THE NR 1 ENGINE (S/N 2107) WAS SHUTDOWN DUE TO OIL FILTER BYPASS LIGHT ILLUMINATION AND A DECREASE IN OIL QUANTITY. FOUND NOSE COWL ANTI-ICE DUCT, (P/N 7958591-501), RUPTURED, BLOWING HOT AIR ON BYPASS LIGHT SWITCH, MELTING SOLDER JOINTS OF SWITCH BODY. REPLACED ANTI-ICE DUCT, REPLACED BYPASS SWITCH, (P/N 42D109-1A) AND REPLENISHED OIL QUANTITY. ENGINE OPERATION AND LEAK CHECKS NORMAL. CHECK C-1 - 1-12-94 - STL.