As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDIS 631 21-01 2533072 08APR21 ROA CLOSE AFTER TAKE OFF UPTO 6000FT WITH BOTH BLEEDS ON BURNT BAGEL SMELL IN COCKPIT. SMELL REAPPEARED ON SHORT FINAL FACT 08APR21 04:09 ROA BORESCOPED #1 ENG AND FOUND OIL ON BOLT HEADS IN THE FLOW PATH EXTENSION AREA. BORESCOPE #2 ENG, NO PROBLEMS FOUND. SEE HA-300 SEQ #1 FOR DMT TO R/R #1 ENGINE. ALL DONE IAW RR AMM 72-30-00-990-883.