We claim the ornamental design for an accessory support bracket assembly, as shown and described.
FIG. 1 is a top, front, left perspective view of the accessory support bracket assembly showing our new design;
FIG. 2 is a top, rear, right perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
In the drawings, the broken lines depict portions of the accessory support bracket assembly that form no part of the claim design. The broken away symbols in the drawings indicate the appearance of any portion of the article between the break lines form no part of the claimed design.