Refrigerator quit refrigerating

Removed 2 control panel knobs and face plate that is snaped in place using a knife to prey it causing to snape lose.
Removed 4 cover screws that gave me acess to Defrost Timer. Remove two fastining screws on timer unit. Remove electrical color coded 4 prong connector plug. Have to make sure black jumper wire on the new timer kit is connected to the correct one of the 4 prongs as to instruction sheet for my model refrigerator. Reassemble in reverse order. Bingo! Fixed.