Hello, I hope I can offer you some assistance.
Have you tried anything to rectify the fault as yet?
Let me know and I'll reply as soon as I can.
the high level stop light is a bulb and not an LED. To remove the light to access the bulb you first need to remove the top interior tailgate trim. Once this is off you can then see the two holes to access the retainers for the lamp. These retainers are spring loaded to release them you need to push them towards the center of the lamp, there are four in total, the best tool to release them is a long thin flat bladed screwdriver which you can use as a lever to push the retainer in.
Once the lamp is out you can replace the blown bulb. The bulb is a large capless 21W bulb Ford number(NNN) NNN-NNNN
Let me know if I can assist further or if the concern is more than a blown bulb.