In 2000 I purchased a Sony KPXBR300 53” rear projection tv. Along with this I also purchased a 5 year extended service contract. Should I call the service people and have them service the unit? Also what services should they do? Aside from the auto calibration the unit has not been serviced since I got it. I also heard there were some bugs that are now fixed such as the component out on video 5? What else should be fixed? Any help would be greatly appreciated.