Rat probe heater fail.
Mi quest is how the pilot detected this fail. No light,no ammeter current because this heater dont have power in ground.
Secont: the mecanic disconect the heater: HOW? .If pull the respectic CB let the TRP without power.
May be the opposite:the pilot detected current in the ammeter, but is improbable because this check is before start engine.Some is wrong in this information.