Rear right brake light problem

[peter goble]

The warning for rear right brake light out came on a couple of weeks ago, changed all the bulbs and the warning still comes on after about 5 to 10 minutes of driving. removed light cluster today and cleaned all the terminals inside the cluster but the warning light is still coming on after about 5 to 10 minutes of driving. can anyone offer any advice????

[Crasher]

Double check the earth terminal in the plug for heat damage and the pin in the bulb holder