As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF AND WHILE AT TAKE OFF POWER AND APU RUNNING, LIGHT FOWL SMOKE FILLED COCKPIT AND AIR FROM A/C WAS BLOWING HOT AIR. WHILE AVOIDING WEATHER AND WAITING TO LAND, SMOKE DISSIPATED AND A/C STARTED BLOWING COLD AGAIN. NO ANNUNCIATORS ILLUMINATED AND ALL ELSE SEEMED NORMAL. APU LEAKING INTERNALLY. R & R THE APU WITH A REPAIRED UNIT IAW MM 49-10-00, OPS AND LEAKS CHECK GOOD.