The press has called Tekserve Corporation, the idiosyncratic Macintosh repair store in New York City, "The Epicenter of Mac Culture in NYC," "The leader in Apple triage services" and "warm and eclectic - maybe even a little eccentric."Unfortunately, not everyone can get down to Tekserve's West 23rd St location for the clear, down-to-earth Mac troubleshooting advice that Tekserve's owners dispense. For the rest of us, O'Reilly & Associates has published the Macintosh Troubleshooting Pocket Guide ($12.95) written by David Lerner and Aaron Freimark, of "the world's best Macintosh...