ENDOTRONICS <ENDO> HALTED PENDING NEWS RELEASE Endotronics Inc, halted at 1-3/4 on NASDAQ pending release of a news report, on Monday said it was expecting "substantial losses" for the quarter ending March 31, 1987 and the fiscal year ending Sept 30, 1987. The company had cited a dispute over payment by Yamaha Inc, one of its Japanese distributors, over payment of a promissory note for 3,686,000 dlrs in overdue accounts.