ICE is not dropping

to make a long story short, I tried everything out there on the web in order to fix the ice is not dropping. the only thing I didnt do is to replace the main board. in my fridge the board part number is DA41-00107A and I cant seems to get it. in the manual of the RS24/26/27 series (my fridge is over 20 years old) it states:
Main Board(Good) DA41-00139A

Main Board(Better&Best) DA41-00107A

I can purchase Main Board DA41-00139A. can anyone please advise what is the difference between them?