sim lim square 2nd floor, there's a shop called "AVIT", they do retermination.
3rd floor, got another shop, but forgot what it's called...
sim lim tower, almost all the shops will do retermination
AUVEC, if i rmb correctly.
I went to "Rison Radio & Electric Co." At sim lim tower #02-30 to repair my westone w4. My w4 cable got loosen near the earpiece end. Usually most of the stores at sim lim tower don't want to fix this type of issue.
However, the uncle at the store is very professional at cable retermination. He can do it quite fast and very neatly! Totally recommended!