That ref is built by Maytag. service manual for amana bottom mount.
If the evap fan is not running, but the compressor is. Verify voltage as the wire harness to the evap fan, voltage present = change fan. No voltage, change Jazz board.
If the fan is operating properly, check the evaporator. If symptoms of the machine not defrosting are present, check for an open defrost bi-metal. If its closed, change the jazz board. I have not seen any defrost heaters go bad on this machine, but im not saying you shouldn't atleast check it. I doubt it would be that. Good luck.
I always check my work by going into test mode with the jazz board.