Freezer Cold, Refigerator Warm

GE, Side by Side # TFX22ZRXA WW

HELLO !
Sorry to barge in.

Over the past three days, our GE Side by Side has failed.

Freezed AND 'Frige failed. Warm temperatures; ice melted.
Unplugged and let it defrost for 20 hours. Cleanedd and vacuumed eveything.
Rear wall of Freezer was COLDDDD for several hours while unplugged.
Presumed coils were encased in ice and defrosted overnight.

Plugged it in two hours ago and freezer is perfect. However, the 'frige is 60 DEGREES.

PLEASE, any thoughts for a – HOPEFULLY – simple, less than a mortgage payment, diagnosis and repair ?
Many, MANY THANKS.