As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HNL - FLT 529 - LEFT OIL STRAINER CLOGGING LIGHT ILLUMINATED DURING CLIMB-OUT, LT WOULD NOT EXTINGUISH W/THROTTLE BACK TO IDLE. ALL ENGINE INSTRUMENT READINGS NORMAL. AIR RETURN TO HNL. REMOVED NR 1 ENGINE MAIN OIL FILTER. FOUND EXCESSIVE AMT OF FERROUS MATERIAL IN FILTER AND CORRESPONDING DRAINED OIL. REMOVED AND REPLACED NR 1 ENGINE. (M)