If they're anything like my old M747's, all you need to do is unscrew the little plastic nut that holds the axle in with the little plastic tool that came with the pedals, give them a thorough scrub, then fill the hole in the pedal body with grease and bung the axle back in. The grease will be forced through the bearings and out the seal, and they'll be good as new.
Regards,
Suzy