Brake Light problems of the 1999 Chevrolet S10

Exterior brake light lens, located over the back window of the cab, was noticed to have melted. Lens was melted inward toward the two light bulbs. One bulb was not working, having cracked, the other bulb was still working. The lens was melted so that two holes were completely through the thick plastic and the plastic had dripped onto the bulbs and fixture. The lens has been removed and I am attempting to contact a dealer to check electrical circuit and proper voltage generated at the light fixture. The lens and bulbs will need to be replaced.