You may want to take note of the way the truck was parked when you saw the leak at the front of the engine. A very small leak from the throttle body heater may just follow the hose and then drip down. If the truck was parked with the front facing downhill at all the coolant would appear to be leaking at the front of the engine. Of course it's not actually leaking from the front, but it would appear to be.

You'll want the TBH update kit to replace yours, under $30.

I would fix the leak before flushing the system. The issue with the old TBH is the housing corrodes around the hose fittings. If one of the fittings comes out you will overheat the engine if you don't catch it ASAP.

Why change the coolant if you will have to open the system again soon? Fix the leak, or at least attempt to. The TBH is a known issue, replace it and retest the system. You may find that is all it was.

 

Higgs,
Thanks for the input... I did the throttle body housing about a year ago, and looks like the hoses were the issue this time... under 20lbs of pressure the clamps weren't holding the coolant back. While testing I did put an absorbant rag to catch this leak and still was noticing the "other one".
The coolant runs down the edge of the block (see prior pics) and notice some accumilation on the forward most exhaust manifold bolt.
I was thinking I may take it to an indy shop and see what they say once and for all... because, without removing the ACE, PAC, AC Compressor and bracket that holds them... I am hesistant to jump to any conclusions.
Can lay under the truck with a light and mirror... watching the steam (allbeit a very timy stream) trickle down the block and onto the oil pan. Just cannot get any good angles to see EXACTLY where it is weaping.

 

It's your money to spend as you wish. I would buy a small inspection mirror, power wash the engine, and save myself some money. Just think of it this way, you will be paying someone to use an inspection mirror to find a leak, just as you would do. They will make an educated guess(or not) as to the source, just as you would do.

I understand not wanting to be bothered looking for the source of the leak, but unless they remove the components that block them from seeing the area in question they will only be able to give you the same educated guess you have concluded.