Refrigerator 50 degrees, professional installed defrost timer, still did not cool. Different professional (one that has been in the business a heck of alot longer than first one)looked at it and said it obviously needs new fan blower (not sending cold air from freezer to fridge). PROBLEM, This professional is in hospital for 4 weeks and I would like to install Fan blower myself if someone could guide me on HOW TO. And again HOW TO possibly remove new timer and replace with my old one. (Since timer was not the initial problem)