Previous person probably didn't use bulb/electrical grease OR water got in there and caused it to corrode. You can try some vinegar and try to dip the socket/bulb in there (make sure to disconnect the battery terminal). And let it sit there for an hour or so. If not try some WD-40 in there and let it sit for 1-2 hours.
If that doesn't work a little heat from a hair dryer maybe to get the socket warm and to expand.
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