It refers to disassembling the engine and repairing internal parts.
It can be more expensive than other places because it's decomposed.
The original meaning is to replace the engine piston or cylinder part.
Contrary to the actual meaning, Boring, which is commonly referred to in the repair shop, is said to be Boring for any engine repair.
I don't know why, but I think he's calling it that because he's lazy to repair the engine.
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