Static Oil Leak Help Suggestions???????????

The Demons 360 has an oil leak that is leaking about a quart of oil overnight. I see no drips or flows while the engine is running. It appears to come from the high rear of the engine on the passenger side. The area around the rear main and oil pan is dry as is around the oil filter. I've looked at the oil sender and it's dry also. The valve covers seem dry also. Anybody have any thoughts short of pulling the engine?
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