I have a 2021 Chevrolet Silverado 2500HD LT 4x4, CC, SB with the 6.6L Duramax Diesel engine. The trucks left rear turn signal does not work, looks to be a bulb on the top of the tail light and one on the bottom - a warning comes up on the dash “Left Rear Turn Signal Failure” but I cannot find that fuse anywhere in my wonders manual.. any help would be greatly appreciated!