Shimano 105 pedal play

Condormoment
Posts: 29
I've got a pair of 6 month old Shimano 105 pedals, one of which has developed a noticeable amount of play around the bearings. Does anyone know if they are self-serviceable or do they need replacing with something stronger? I guess this might be caused by me standing up on the bike (pedals at 3 and 9 o'clock) too much? Thanks.
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