Scored Main Cap Bearing - Ouch

It is very important to hot tank the block after removing every plug from the oil passages. Then clean the block. and then clean it again. Never let it in the open always keep it bagged until it is buttoned up. Also every part should go in a sonic cleaner that goes in the motor. Heat shield taken off the intake and cleaned. . You would not believe how many fresh motors come here looking like yours. Shops think throw the new parts in and send them down the road. I
If you wouldn't have had the leak you would have never saw this until it was to late.

I wouldn't let him touch it again . Take it as a lesson learned and move on to a shop who takes pride in their work. I have mentioned this once in a thread. When taking your engine to a shop. Ask to see the shop and make sure the machines are clean and on piles of metal on the floors around them.

Look at the out going work such as heads and short blocks, They should all be bagged and on a clean shelf.

Would you sit on a shitter without looking at the underside of the seat? Some people only clean what they have to to get by. You have to watch out for your own *** in this world. LOL.