Indeed that wants to be warranty job, though i would agree with changing all if one had failed, hopefully at this mileage there's less chance of one snapping off than when they've been in situ 10 years.
Cost seems high, but access to anything on the heads is a nightmare, i changed the spark plugs on our H6, once was enough had the scars on the backs of my hands and wrists for weeks, i let the LPG converter swap the Forester set out whilst being converted.
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