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Fisher & Paykel Dishwasher Repair

Error message E30 showing sporadically. About 7 years old. Door inner has been replaced as thought it was possibly a door seal issue, worked fine for a few weeks but now error code coming up again. Ideally don’t want to spend too much if it just needs replacing, would like an opinion on whether is an easy and affordable repair or if we just need to buy a new one.