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Pull the pod so you can work on the bench with it. Easy to remove. Open both back ports and inspect with a flashlight. The insulation fails in numerous Hella's of the era.
You can restore them to working condition by applying shrinktube on the bare wires you can reach, and making sure none of the wires a touching.
The ones you can't reach are unlikely to touch in the absence of manipulation. That's often why lamp errors occur after bulbs are installed, particularly if bulb are installed in the pod while it's in the car. Best to work on the bench with these pods.