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Translating step 4
Disconnect three thin delicate cables from the PCB. The largest cable ① comes away without too much trouble, by sliding it gently in a same plane as the PCB - but the really small fragile connectors are a different story.
The two smaller connectors ② & ③ do not disconnect like the first - despite appearances, they pull directly away from the PCB (credit Feanor - thank you - see references in conclusion).
Place a small plastic spudger at the top of the two connectors, behind the wires and, pull gently forwards - click, off pops each connector.