I own a maytag MBL2256KES. It is not staying cold. What should we do? It is 3 years old

Check the condenser coils first and if dirty wash out with spray cleaner and water from hose nozzle. Here are some manuals: https://dl.dropbox.com/u/8010163/Maytag%20Refrigerators.zip
The new refrigerators with the R-134a are inferior to the older R-12 models. We need to have this bad law repealed that caused this problem because by now it's obvious that R-12 caused no problems and is 50% more efficient.