Left rear fog lamp/Multi-purpose or not?

[Rattnalle]

Perhaps the bulbs quality has lowered. One thing that always burns on these P2 are the two rear plate lights - their sockets get corroded (on the same wire loom as the trunk switch button)

The light housings get full of algae as well over time, at least in our damp climate. That's why I replaced mine with sealed LED modules. They're still like new after three years, had to spray paint parts of them to lower light output to a reasonable level though.

They're in the pictures I posted.