What was found
ORD - FLT 4053 - DURING CLIMB-OUT, BOTH LAVATORY AND BAGGAGE SMOKE INDICATION CAME ON. AIRCRAFT RETURNED TO ORD. NO FIRE PRESENT, SMOKE WAS SMELLED AREA. REMOVED AND REPLACED BOTH ENGINE (S/N 311069 LT, 311071 RT) DUE TO BLEED AIR SYSTEM VALVES. OPS CHECK GOOD. (M)