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Hydrolocked 6.7

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So I got one here that customer is complaining of coolant loss. Says he noticed that it seemed to be running warmer than normal, and when checking the coolant found the primary side 3 gallons low. I check it yesterday and a pressure test finds no external leaks. Bellhousing, radiator, water pump is all dry and no signs anywhere of any leaks. I let it set for probably 45 mintues to an hour with 16 psi of pressure on the system. I go back to move it off a drive on rack to a flat stall to pull the EGR cooler and bench test it and it hydrolocks on start up. I pulled the pipes off the EGR cooler and they are dry. Pulled all the glow plugs and all 4 on the drivers side is wet, and #5 glow plug has melted the tip. I've sent in a request to hotline, but haven't heard anything back yet. Anyone got any ideas?  I'm wondering if the cooler began leaking, and the low coolant levels caused my driver's side head to crack. This one  has ESP coverage( truck has 121,000 miles on it),  so I'm trying to figure out exactly how far I need to tear down.  Sorry the pic isn't clearer, I was having some issues with the camera.

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TSB 12-11-11?

 

Doesn't fit the TSB. No codes at all and it runs fine. Guy just noticed it running warmer than normal. Hotline thinks the melted glow plug was caused by engine overheat from low coolant, and recommended to replace both cylinder heads. I'm gonna get the heads off later and see if I might have any more damage.

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