Repairing the appliance does not establish the earlier temperature history of every food item. Food-safety decisions require the relevant storage information and official guidance.
What the observation tells you
A restored target and normal running sound show aspects of current operation, not whether a meal was previously kept too warm. The engineer may also not know when the interruption began. Do not treat a successful repair as permission to refreeze questionable contents.
A useful next step
Keep the food assessment separate from the repair outcome. Record known timings, follow product instructions and use appropriate food-safety advice for uncertain items.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.