As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN RATE ON CLIMB ERRATIC PLUS/MINUS 1000 FPM IN AUTO DURING LEVEL FLIGHT FL390 SWITCHED ASC DURING DESCENT HEARD BANG WITH BURNING OR DIRT ODOR. ODOR WENT AWAY DURING LANDING, NO ABNORMAL INDICAITON ON AIR PAGE SYSTEM, OK IAW FIM 21 21 05 00. NO FAULTS ON CPC'S OR ACCS UNABLE TO DUPLICATE ANY ABNORMAL SOUNDS OR ODORS DURING PRESSURIZATION TEST IAW MM 21 31 00 700 801 OK FOR SERVICE