led indicator light not working

hi guys,
i have changed my lights on my defender110 [2008] to led.not headlights tho.all the lights work except the rear l/h side indicator.i swapped the led light over to rear drivers side and it works .so i know the led indicator is ok.i then disconnected all the led indicators ,changed the flasher unit back to the original flasher unit and put an old indicator on the side that is not working,and it works ok ,so i'm thinking the wiring is ok.i have now
refitted all the led indicators and changed the flasher unit to a new flasher unit.adjusted the flasher unit so the trailer light goes out.all the led indicators work except the rear l/h side still?.any help wopuld be appreciated.thank you.

Swop the two wires over in the bulb holder on the faulty one.

hi flossie,
absolutely fantastic advise ,spot on.just swapped them over everything working ok.thank you very much for your help.