Ida N Champaign , IL June 26, 2015 Appliance: Maytag Refrigerator PTB21AAGRW Maytag Refrigerator Ptb21aagrw: The refrigerator was missing the temperature control knob for fresh foods. How to replace Control Knob. The refrigerator was in the condo that I purchased. Replaced the knob with one ordered from appliance plus. I ordered the knob and received it the next day! I easily snapped the knob in to the appropriate area. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes