What you need is a professional Marine Surveyor. This vocation (though
unregulated and occasionally populated by practitioners of questionable
repute) is made up of folks who know and understand all of a vessels
'systems'. You'll be given a thorough run-down of everything in and on
your boat, as well as a report on the integrity of the hull.

Ask around for the name of reputable Surveyors in your area who do work
on pleasure craft (some specialize only in larger boats) and get - then
check on - references.

A quick Google of 'Marine Surveyors + Philadelphia' turned up several
leads.

Mike Worrall
Los Angeles