Here's the rest of the story and this might help providing an answer. Also, he had a brand new door panel and replace it. So far CarChex gave it an "Excellent" Condition with the two issue mentioned above.
2003 Supercharged
Polished Paxton Novi 2000 Supercharger unit.
Air/Water aftercooler.
Two piece billet front mounted harmonic balancer.
Exclusive DLM broached crankshaft snout for extra secured balancer support.
Colder temperature range spark plugs.
Mobile One synthetic oil and filter replacement.
All related fluids replaced.
Professional installation. Douglevin Motorsports
Thanks!