Kegerator Repair

I have a commercial Beverage Air cooler that I converted into a kegerator (see my profile pic). It has developed a condition where it is getting 1 degree warmer every couple of months. It likely needs a gas recharge. Does anyone know of a refrigeration guy looking for a job to do? I like to give a chance to the independent repair guys before I resort to calling a big company to do a job. Thanks!