An Acronym for Cutlass Beat Off Taillight Syndrome.
Virtually all 1973-1977 Oldsmobile Cutlasses had a badly designed connector for the left taillight bulb, and on
virtually all of the cars within a few months of manufacture the left taillight bulb would quit working. A little elbow grease and bending with a
needle nose pliers could get it shining again. I doubt if the manufacturer (GM) ever knew about it, or if they did, they did nothing about it.