Frig would go warm occasionally

I removed the screw that held the control module in place, then unscrewed & unplugged the circuit board and plugged the new one in. At that point I realized that the mounting bosses on the new piece were a quarter inch longer than the old one and the screws were now too short. The old bosses couldn't be adapted without wrecking them. Luckily I found screws out in the garage that worked. The screws that came with the new piece were the same as the old ones. Also they were packed loose with the circuit board and one was stuck between the protective cover and the pins. Thankfully it fell out on its own before I plugged the refrigerator in.