Track the first patch
Describe where new frost appeared first rather than only the final thick build-up. Mention door closure, new loading and visible warnings.
Do not repeat an improvised procedure
Use only the model's own ordinary defrost instructions. Sharp tools and heat sources can damage the appliance. Suitable assessment may cover closure or controls, while sealed-system repairs remain excluded.
A useful distinction
The interval before new ice appears can be more useful than the time taken to clear the old accumulation. Keep a dated ordinary photograph if convenient, without turning repeated defrosting into a substitute for assessment.