TOKYO, Nov 14 - Japan's diffusion index of leading economic indicators for September has been revised down to 72.7 from a preliminary 80.0, Cabinet Office data showed on Friday. The leading index, compiled using data such as the number of new job offers, consumer sentiment and Tokyo share prices, is taken to signal economic conditions for the next few months. A reading above 50 indicates improvement. The September coincident index, which indicates current economic conditions, was revised up to 90.0 from 83.3.//