Everything has been working fine and now this last week top shelf staying cool between 46 -41 and remainder of fridge 35-38. Freezer working properly. Can’t figure out why top part won’t keep temperature regulated.
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=MCBR1010W
Is the evaporator/freezer fan running?
It is required for proper air circulation in the unit.
Check that the unit is level front to back or leaning slightly to the back.
Check your door seals.
Check that they are clean.
Take a 2 inch wide piece of paper, place it between the door seal and the frame and then pull it out to check the seal.
Work you way around the door.
Check the hinge side of the seal. Sometimes they can grab and twist when closing causing seal problems. A light coating of vaseline or white lithium grease usually fixes this.
Could be this is an ealy sign of a defrost problem. often it shows up first in the fresh food compartment and then in the freezer. To check for this you will have to remove the cover at the back of the freezer so you can inspect the coils. If they are heavily iced/frosted over to the point that the evaporator fan has problems pulling air through them then you have a defrost problem.