14/10/2026
This may seem a bit innocuous, but this is a burner door seal. When they fade to this grey colour they're getting to the point of failure. Part of a service is to check and replace things like this. Failure to do so could result in significant, possibly catastrophic, damage. (See pictures in comments of one that had failed recently)
Check your small print if you have a service contract with some larger nationals as they are often a safety check rather than a service (if the engineer is only there 15-20 minutes thats a good indicator) so this sort of thing wouldnt be picked up.
Get it done properly. Use local.
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