2012 24v HELP!!

[EGTittey1]

Ok question to the crowd!

 

what would you do ?

 

A customer paid me to just put a set a used injectors in  I agreed with a disclaimer.. while putting them in I noticed that one body had DAP engraved and IQA code was way off or different language/ used same code for that cyl that was programmed allegedly he had them flowed at a pretty decent local shop here In nowhereville.. the trucks setting a #6 cylinder white smoke horrible.. he failed to mention its a stock tune or that his turbo was seized recently and he had it replaced at a flying Jim shade tree location outside of wtfville.. so is this a tunable thing or a pull apart bc it’s Not fixable to run one dap and the rest stock? Or maybe adjusted with cal?? He’s not giving me **** for anything he just wants back to regular operations and idk what to do.. help out guys

[AH64ID]

White smoke is uncombusted fuel, so it's likely not tuning if it's just 1 cylinder doing it.