How can you tell if they're bad? I didn't notice noise, but a few of the rollers look scratched on the outer bearing. The inner bearings seem a little discolored (amber-ish). I safely removed the seal, does it need to be replaced each time it's removed? How can you tell if the seal is bad? The rubber seems smooth without nicks. Should I remove the races the bearings ride on? The new ones I noticed come with new ones. Thanks guys!