Raptor's cobra roll cracked during a morning test ride (the team leader's last day, wouldn't you know), in '98, in August. They welded it back together, tested it, and were running the coaster again by 8pm. It was spooky, working there you really know what the coaster is supposed to sound like, and I was on the midway that morning when it DEFINATELY did not sound right, and every employee whipped around to look! Proof positive that the test rides and checks are necessary every morning, and CP does them without fail.
As for the pre-season inspections, I'm not so sure, but they do involve running the trains and all the normal daily checks as well as the more intensive ones.
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PO!NT OF VIEW - A Different Look at Roller Coasters
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