What was found
DURING CLIMB THROUGH FL 270, THE LEFT ENGINE INDICATED N1 OF 82% VS N1 95%, FOR THE RIGHT ENGINE. LEFT EGT WAS 120DEG. LOWER, N2 WAS 10% LOWER. RUDDER TRIM OF 4 RIGHT REQUIRED. LEVEL AT 270 ALL INDICATIONS THE SAME FOR BOTH ENGINES EPR 1.37, N1 75%, EGT 505, N2 75%. NORMAL OPERATION FROM LEVEL AT FL270 . WHILE INSPECTING P1 PROBE LINES, FOUND LINE IN NOSE COWL CRACKED IN HALF, R & R P1 PROBE LINE IAW AMM 72-00-00-2. PERFORMED EPR P1 SYSTEM TEST IAW AMM 77-11-00-5 . SYS CHECKED GOOD.