As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PUNGENT ODOR DURING FLIGHT. ODOR DIMINISHED COMPLETELY WITH "RT ENG BLD AIR" SELECTED "OFF". TROUBLESHOT AND FOUND RT BLEED AIR HEAT EXCHANGER LEAKING. R & R RT HEAT EXCHANGER WITH NEW AND SECURED IAW MM 36-10-00. RUN ENG, OPS AND LEAK CHECKED NORMAL.