mitsubushi city bc box repair

hi people .
just wanted to ask if any one had brazed inside a bc controller box .
our tech man told me the whole box would have to come down . dismantle it , braze in the new part .
and the re braze all the pipework connected to it .
i wondered if it was possible to support the pipe work to the box and the pipework to the indoor units , remove the casing and do the repair and the after a pressure test .
re assemble the casing .
or am i barking up the wrong tree?
your input would be welcomed , cheers in advance .

Your best bet is to take it down there a pain in the ass to do any repair to

Hell of a lot easier to drop it down, better get it repaired right the first time. They are pretty tight inside!

What part are you replacing?

i am not doing the job .
and was working on another system one floor above.
sadly not enlightened into how they went about it .
but know if i want a correct answer to a problem .
i will get it here .
cheeers for your help folks .