Removed the double oven from the wall, replaced cooling fan and reinstalled wall oven. This repair is very simple. Shut off breaker that powers the oven. Remove trim on front of oven. Remove mounting screws that hold oven in place. Get help for the double wall oven (can be done by one person but safer and easier with 2). Set oven on dolly. Remove rear covers on oven. Disconnect power connectors to fan. Remove fan mounting screws. Replace fan and reverse removal.