It is important to remember that water can move in strange ways. Sometimes the leak on a class C overhead is underneath. Check the side seams like jimbo12 shows and also look at the seal between the roof of the cab and the house above. Look closely at the roof seams on your hands and knees on the roof. Use self leveling RV roof sealant if there is any suspicion of even a hairline crack or gap. If your eyes are not great (like mine!) a second set, attached to a young person can help. (Not implying anything here, just sayin). There’s only so many places it can be but if you keep after it you’ll find it. Good luck.
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