Dometic Refrigerator Lightbulb

[cooney]

Greetings:

We have a 2008 Safari 27' FB with the standard Dometic refrigerator. The control board was replaced in April, and all is well, except: We have burned out, in short order, three interior lightbulbs. To the best of my ability to ascertain, the bulb switch in the door is functioning, and the voltage in the bulb contacts seemed fine. The bulbs typically burn out in two to five days.
Otherwise, the refrigerator is a perfect servant.

Any ideas, or solutions? All the Best.... Jeff Cooney