Technician coming to home to replace 27" screen?


i have screen yellow issue, grey bar , buzzing noise when brightness lowered. apple has offered send technician home replace screen , whatever necessary. wondering if has been successful way solve problem or better off them sending me newer built imac? seems place not sterile or dust free environment, , if new screen same or worse, i? perhaps safest way screen.
on other hand, if ask newly built machine, if worse stay put imac have.
has had successful outcomes 1 method on other. replacement screen worked on @ home, or stab @ new computer?
 

i work in medical industry remarking environment isn't 'sterile' made me chuckle.

seems less have damage shipping twice , having tech replace lcd versus replacing in house. said, house might more dusty service center, maybe not. clean , use air filtration unit or help.
 


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