As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTICED BURNED ODOR FUMES IN COCKPIT AND CABIN WHEN OPERATING PACK 1 USING THE APU AT THE GATE. DETERMINED ODOR FROM NR 1 PACK AND DEFERRED NR 1 PACK. MEL REF 21-30 AUTH 070552D-C. R & R NR 1 PACK ACM IAW AMM 21-51-03. OPS CHECK GOOD. MEL 2130 RESTORED.