Japan's service sector expanded at a weaker pace in September as business activity and new orders grew more slowly and earthquake disruption dampened demand, a business survey showed on Monday. • The S&P Global final Japan Services Purchasing Managers' Index (PMI) eased to 51.3 in September from a five-month high of 52.5 in August, a survey by S&P Global showed, worse than a flash reading of 51.6. The 50-mark separates growth from contraction.