What was found
ABORTED T/O DUE TO WING A/I HOT L CAS MESSAGE. RAN ENG, TURNED ON SLAT ALI FELT LT & RT WING L/E'S DID GET WARN. I/B LT WING L/E REMOVED TO INSPECT WING L/E A/I DUCT O-RING. ACCESSED IMT I/B, MID & O/B WING, TEMP NORMAL. COULD NOT DUPLICATE CN SUBSEQUENT ENGINE RUN. REMOVED LT I/B L/E WING, INSPECTED BLEED AIR TUBING, FOUND O-RINGS WORN. REMOVED LT WING L/E ALI TEMP SENSOR P/N S100420PG, S/N 3970A. INSTALLED A NEW SENSOR P/N-S101816PG, S/N -1004. REMOVED & REPLACED (3) O-RINGS P/N 2-214S469-40 FROM HEATED L/E LT DUCT WORK. RE-INSTALLED LT I/B HEATED L/E & WING ROOT FAIRING. RAN ENG. TUNRED ON SLAT ALI WING I/B, MID & O/B, TEMPS NORMAL. NO BLEED AIR LEAKS, OPS GOOD. RESEALED LT I/B HEATED L/E.