weird auto light issue

[ChA6dders]

If I leave my light switch in auto they come on as normal and after about 15 / 20 min the rear N/S tail light / brake light goes out and shows a blown bulb warning on the dash. There is nothing wrong with the bulb & this is the only light affected.

IF however I switch the lights on and off manually I don't get the problem

Any ideas as to what's going on here

[Guest 2]

Rear light clusters have corrosion, check the massive thread in this section.


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[ChA6dders]

I'm aware of the issues in the tailgate lights but this is in the cluster in the rear wing where the indicators are the indicators aren't affected and it's only during auto lights not manual switching on

[Guest 2]

Check the contacts anyway.