Also when did Han become an expert on fixing The Falcon?
This kind of thing always makes me laugh, since Han’s whole act was just bravado. The other characters in ANH clearly know this and in ESB he never even fixes the broken hyperdrive.
Speaking of ESB who can forget when Han showed his prowess by hitting the Falcon with his fist to get some shit to work? If that doesn’t make you an expert then what does?
On a side note I always loved that R2 fixed the hyperdrive given Han’s disposition towards droids