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Fridge repair

We have a fisher and Paykel fridge/freezer. Unsure of age but possibly around ten years old. It’s a white one with the silver/metal handles. The fridge is making a loud rattling noise when the doors are closed then when you open a door it stops. We thought it was a fan hitting a buildup of ice. We have had the fridge defrosting for the last two days but when we turn it on it still makes the loud noise even though there’s now no ice left. Possibly a broken fan?? We’re not sure whether it’s worth repairing or whether we just replace the fridge so just wanting to know if there are any reasonably priced repairers that might be able to quote on a cost to fix.