Comcast Xfinity KXW02AAA

Overview
This would appear to be slated for use by Comcast for their Xfinity service set-top boxes.

"WLU5250-D143" and "REV:3" is silkscreened on the back of the board.
 * A date code of 1343 is visible under the RF shield.

A E6:28:EF OUI may be used by some / all devices - it's shown on the FCC sample label. The VID + PID pair in this etnry is per the FCC manual.