need some advice delivered a Reconditioned cooker to rental customer, the cooker had been fully reconditioned, installed it showed them it fully working, customer calls to say it caught fire, after he reckons he put a tray of cooking oil on 1st shelf to heat up to do his roast he reckons only left for short while and when went back inside to kitchen the cooker had caught fire from this oil, i thought oil dont catch fire till 300+ degrees now he wants to claim for damage done to kitchen…