I have a Felt F30 road frame. It's AL with CF CS and SS. The 3 year warranty has now expired (about 8k miles on the frame), leading me to think its a good idea to start checking over the frame on a more regular basis to make sure everything is still hunky dory. Thus far I have been just looking it over carefully and checking for cracks or dents. Is there anything more to it than that? What specifically should I be looking for and how often should I check it closely? My area of biggest concern is where the CF is merged with the AL on the SS and CS.