As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF WHILE CLIMBING THROUGH 1,000FT, AN ACRID ODOR IS DETECTED COMING THROUGH THE INSTRUMENT PANEL GASPERS. ODOR SUBSIDES AFTER CLIMBING THROUGH 4,000FT. ODOR IS PRESENT AGAIN AFTER LANDING WHILE TAXING TO PARKING. APU IS OFF WHEN ODOR IS DETECTED. REMOVED AND REPLACED HEPA FILTER AS REQUIRED P/N OFF-9914836-1 S/N-0793 IAW AMM 21·70-10 OPS CHECK GOOD NO FUTHER DEFECTS NOTED AT THIS TIME.