SACRAMENTO (AP) - Jesse Ceniceros was at the top of his profession as a mechanic for Lockheed when he was injured on the job and fell into California's workers' compensation maze. Now, out of work, hobbled by pain and in need of hip replacements, he may lose tens of thousands of dollars in benefits because of a key part of the sweeping changes in the 91-year-old system that were pushed through the Legislature earlier this year by Gov. Arnold Schwarzenegger. Other workers who suffer serious work-related injuries could face the same problem if courts decide the new law requires doctors...