Double convection oven cooling fan was failing, making a loud noise.

Turned the circuit breaker to "off"
Unbolted the unit from its cabinet (4 screws - visible when the oven doors are open - secured the unit in its cabinet)
Slid the unit out of the wall about 2 inches
Removed the control panel.
Unbolted the cooling fan assembly
Unplugged the assembly from the wiring harness
Removed the cooling fan from the oven

Plugged in the new cooling fan
Bolted the new fan in place
Replaced the control panel
Slid the unit back into position
Bolted the unit in place
Turned the circuit breaker back on
Tested

No problems - the hardest part was having to reach to the back of the oven from the front.