How do I replace the light swith on the GE monogram refrigerator

SOURCE: GE Monogram freezer side working but refrigerator side is not.

Did you clean the condenser?  Is the unit FULLY defrosted?   Defrost fully!!!!!!
Did he check the amount of gas in the unit?  If your unit has low gas...it is in need of more.  R12 is expensive.
Check gas level:  Shut unit for at least one hour.  View compressor.  Several pipes...we're looking at the largest.  Start the unit.  This pipe will begin to frost.  If it does not clear to dry, ice or wet...stays frosted...it is low.  Get the repair guy back ... but ask how much he'll charge first.