The ornamental design for upper liftgate panel, as shown and described.
FIG. 1 is a rear perspective view of a upper liftgate panel showing our new design;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a side view thereof;
FIG. 6 is a opposite side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
It will be understood that the broken lines shown in the drawings illustrate portions of the upper liftgate panel that form no part of the claimed design.