I had the ballast fail on my C70 - under the passenger front wing on mine. Switched the igniters and bulbs and same side always failed, so ballast was next on the list. Volvo replaced FoC, but the car was only just out of warranty. Anyway, problem solved with the ballast change.
Nearly forgot. New bulb seemed to solve the problem, but problem returned after 3 months and then did the ballast change.
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