What was found
AIRCRAFT WAS GROUNDED: CABIN ODOR EVENT. FOR 60 PERSISTENT MINUTES THROUGHOUT THE CABIN,INCLUDING THE FLIGHT DECK. A DIRTY/NUSTY ODOR WITH A HAZE WAS EXPERIENCED. REMOVED AND REPLACED APU OIL SUPPLY LINE AND PACKINGS IAW AMM 49-91-44, OPS GOOD, NO LEAKS NOTED.