As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH ENGINES RUNNING BURNING SMELL NOTICED IN REAR OF A/C AND IN COCKPIT VERIFIED SMELL WITH NR 1 BLEED ON, LT PACK ON, ISO VALVE CLOSED. COULD NOT DUPLICATE IN ANY OTHER CONFIG. FOUND NR 1 STARTER OIL LOW WITH METAL CHIPS. REMOVED AND REPLACED STARTER, TT 0107843.