Back turn signals conector

Hi everyone,

My back left turning signal is failing now and then...
I checked the bulb, the connections,...and I think it is a bad connection on the plastic conector seen on the picture below.
I would like to remove the metal terminals from inside the plastic housing to check the connection to the electric wire.
Do do know how this is done? Shall I insert a very small screw driver on the holes were the electric wire is inserted on the plastic housing?
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Thanks

Pin removal tool.