Servicing Look S-Track pedal bearings

I have a pair of Look S-Track race pedals in which the bearings have started to creak, and a quick look around on the Internet hasn't turned up any information on servicing the pedals. For example, does the hexagonal plastic nut where the axle exits the pedal unscrew - if so, does the nut on both pedals have a RH thread or does one have a LH thread?
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