U9 in wc group is problem with HVPS. check charge & trf corotrons for leakage. isolate with removing charge or transfer corona each at a time.... U9 disappears; Reinstall HVT. Clean charge corona sawtooth & grid; tighten the grid on charge corona assembly.
THIS IS A SCAM-- DO NOT CALL THESE NUMBERS. These phony support numbers send you to criminal call centers where they will install malware, steal ID and/or extort money from you . Please only ever use the support contacts from the official company website