Using my S510 this weekend, the big red push button seemed somewhat sticky. Upon closer inspection, I noticed that the button was cracked. The watch still works, but I want to have it repaired. I originally bought the watch from a major sports outlet, but returning it to them and then waiting for them to send it to the Polar service centre will probably take months. Anyone know where the Polar Service Centre is here in SA or their contact info, as working directly with them will probably give quicker results?