maytag side by side f/f forming ice!

[iqh]

hi my maytag fridge+frezeer side by side model GS2928EEDW/11. I will appreciate any help or advise on this problem.Thanking all in advance. i am not an engineer.
1.The problem is on the freezer side it seems to work ok but am finding ice patches under neath the last storage tray (bottom tray). I am assuming (may be am wrong) this is coming from inside the frezeer from the back freezer wall which has a grill.
2. before writing this i turned the setting switch down that is from mid temp to down and as as expected the freezer swithed off and when i turned the switch to high temp the freezer is quiet its not kicking in.
am not sure what is happening!!

[iqh]

please note no 2. the freezer is ok up and running but i have problem with my point number 1 which is icing up!

[happy]

The drain hole is blocked

[iqh]

Hi Lucky thanks very much for your help.
Any idea where i can download manual for this particular uk model. The magtag website doesnot recocnize this model!!
thanks