As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING TC 78472040 NR 2 ENGINE AGB/TGB CHIP DETECTOR CONTAMINATED WITH DEBRIS. GROUNDED-YES. INSPECTED DEBRIS, PER B737-900 AMM TASK 79-00-00-200-804-F00. DEBRIS DETERMINED TO BE WITHIN ACCEPTABLE LIMITS. NO STARTER MAGNETIC PLUG CONTAMINATION. REPLACED SCAVENGE OIL FILTER ELEMENT, PER AMM 79-21-06.