Mine is simply pull glass cover straight down. Others are turn 1/4 turn ccw then pull down. The 1/4 turn method works for either type. The lights are G4 pin mounts. They fit kind of loose in socket as pins are so small. Bumps from towing/traveling could jostle a light and make it appear burnt out. It may simply need to be pushed back into its socket to work again.
Below is example of G4 style pin mount. You have to pull one of yours to figure out glass globe style, led style/mount and how many smd leds your light has. smd = surface mount device. Columbus has used different styles throughout the couple of production years now.
Count how many led segments are on your bulb. Then go online to ebay, amazon, etc to order them. The dealer upcharge on these led lights is crazy. Order them by 6 pack, 10 pack, etc.