As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AN ODOR WAS DETECTED WHEN THE BLEED SYSTEM DUCT TEMP EXCEEDS 20C. THE APU AND ENGINE BLEEDS WERE RUN ON THE GROUND AND ODOR DISSIPATED. SUSPECT RESIDUAL DE-ICE FLUID CONTAMINATION OF APU DURING MORNING DE-ICEING OF AIRCRAFT. AIRCRAFT WAS RELEASED FOR SERVICE WITH NO FURTHER DIFFICULTIES REPORTED.