Ohm your defrost thermostat for continuity while its still frosty to get a proper reading, should read 0-1 ohm. If the defrost thermostat is not frosty when you ohm it, you will get a high reading.
Defrost Heater Assembly 61006116 Order now for same day shipping. 365 day return policy. RepairClinic.com
Just remove the plastic connector and Put your ohm meter probes in the black and white wire plastic connections you see in the photo above, remember it has to be still frosty for a proper reading. Should read 0 ohms.
Your defrost thermostat and defrost heater is combined as one part, its #12 here: Freezer Compartment parts for Maytag MSD2454GRW
You have to remove the lower back panel#20 inside your freezer(which you've already done):
Watch this video:
<IFRAME height=390 src="http://www.youtube.com/embed/311BiD76iYg?rel=0" frameBorder=0 width=640 allowfullscreen></IFRAME>
Let us know what you find.
Jake
Defrost Heater Assembly 61006116 Order now for same day shipping. 365 day return policy. RepairClinic.com

Just remove the plastic connector and Put your ohm meter probes in the black and white wire plastic connections you see in the photo above, remember it has to be still frosty for a proper reading. Should read 0 ohms.
Your defrost thermostat and defrost heater is combined as one part, its #12 here: Freezer Compartment parts for Maytag MSD2454GRW
You have to remove the lower back panel#20 inside your freezer(which you've already done):
Watch this video:
<IFRAME height=390 src="http://www.youtube.com/embed/311BiD76iYg?rel=0" frameBorder=0 width=640 allowfullscreen></IFRAME>
Let us know what you find.
Jake