Joann W San Jose , CA August 25, 2015 Appliance: Maytag Electric Range MER6770AAW Maytag Range Mer6770aaw: Glass cooktop developed a crack. How to replace Cooktop. I ordered a new top from AppliancePartsPros. They had a very good system for verifying that the part I ordered was the correct version for my appliance, so there were no worries. It arrived safely in a timely manner and I installed it the next day. Found directions online which worked fine. Had a little trouble getting first screws loose and then needed to buy a nut driver. All else went smoothly and I have a lovely new cooktop! The only odd thing was that they had me call them back to tell them verbally exactly what I had ordered - including adding up the numbers. Very strange and made me suspect they may be scamming me - but NOT! All went fine. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours