As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5028 ODOR IN CABIN AFTER APU START. CORRECTIVE ACTION: FOUND EVIDENCE OF DE-ICING FLUID IN APU INLET C/W WORKCARD 2100-2005. R/R CABIN RECIRC FLITERS PER A321 AMM 21-21-41. WASHED APU INLET AND COMPARTMENT. NO SMELL AFTER RUNNING ENGINE ALL OPS NML. (0145885)