07 Pontiac GP 3.8 engine. Coolant Leak.

What is your question?

Coolant appears to be leaking around the horizontal 10 mm head flanged bolt passenger side behind the air conditioner compressor close to the harmonic balancer. When I described it to a dealer he said it was main bearing horizontal bolt. 24505576. Odd if it's a main bolt that it would be leaking coolant. Temped to remove and put gasket maker on the flange. Any help would be appreciated.