It depends on the workshop, normally, the official Honda services and the \ "normal \" workshops use exchange pumps, that is, they remove yours, and send it to repair, while the workshop serves a repaired pump with guarantee to mount in its place.
Cutres workshops use the scratch exchange system, that is, they put a scrapping pump and pull miles.
And the workshops \ "specialists in diesel and gasoline injection systems \" what they do is repair the bombs of the other workshops in addition to mounting and disassembling bombs and injectors into cars (among them yours if you go to one of them of course).
There are specialist workshops that also have mechanics and electricity \ "normal \" that is, they also make clutches, brakes, directions ...
greetings.