the MML400 has 1 fans total (see below). to service: Turn key and also UNPLUG power supply in back 1. to access p/s tray in back it easiest just to remove the aqx 2. open tray in back and remove 2 screws that connect aqx to aqr_p 3. remove all bolts up front necessary to slide entire aqs out 1/2 way 4. now try to get the aqx out by itself
original_fan - original MML400 fans - PAPST TYP 612 (12Vdc, 0.21A, 2.5W, 24CFM, 60x60x25mm, 2 wire) , need 1