I think we need the 22V for IC91 to work. Double check you have D91 the right way around and check the diode next to it is not shorted (was this replaced?). You should have continuity between R91 and R98 as you say - I think I need a pic of the underside of the board covering R98 to D91 and IC91. If you have a high voltage on R91 it could damage C92 - what voltage rating is C92? C92 could get very hot and even explode!!!!!!!!!!!!!!!!