Can't help with the workshop manual I'm afraid, but generally the Caymans, Boxsters and Carreras are all very similar in their service schedule requirements. To be honest, it's the wear and tear items you want to check really, suspension and radiators/condensers being the more costly items.
– 2009, 2010, 2011 and 2012 Porsche 911 (997.2) Carrera / Carrera S, 4, 4S (NOT for 997.1 versions neither for 997.2 GT3, GT2 and Turbo)
– 2009, 2010, 2011 and 2012 Porsche Boxster/Cayman normal and S models (987 and 987c)
Oil Change Every 10,000 miles (15,000 km) or 1 year