What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: belt used to drive hydraulic pump was found broken. Extra belt which is secured over the housing was installed and aircraft returned to airport. Later investigation noted that the air conditioner belt broke first privacy data omitted aircraft had departed Meigs airport, Chicago, IL, when suddenly the aircraft hydraulic system was noted inoperative. The pilot made a precautionary landing without further incident. There was no fire nor injury.
As the FAA filed it
NARRATIVE: BELT USED TO DRIVE HYDRAULIC PUMP WAS FOUND BROKEN. EXTRA BELT WHICH IS SECURED OVER THE HOUSING WAS INSTALLED AND AIRCRAFT RETURNED TO AIRPORT. LATER INVESTIGATION NOTED THAT THE AIR CONDITIONER BELT BROKE FIRST ^PRIVACY DATA OMITTED^ AIRCRAFT HAD DEPARTED MEIGS AIRPORT, CHICAGO, IL, WHEN SUDDENLY THE AIRCRAFT HYDRAULIC SYSTEM WAS NOTED INOPERATIVE. THE PILOT MADE A PRECAUTIONARY LANDING WITHOUT FURTHER INCIDENT. THERE WAS NO FIRE NOR INJURY.