GM: 1995-2001 Chevrolet; GMC S/T 2-Door and 4-Door Blazer and Jimmy; 1996-2001 Oldsmobile Bravada

Bulletin: Rear Roof Perforation According to GM Bulletin No. 01-08-66-011B, some 1995 to 2001 Chevrolet and GMC S/T 2-door and 4-door Blazers and Jimmys, as well as 1996 to 2001 Oldsmobile Bravadas may experience rust forming in the rear portion of the roof. GM indicates that this is caused by the E-coat missing on this part of the roof. According to the bulletin, labor operation A9970,