Check 32V Unregulated supply in particular. Check Fuses F736, F746 and F768. A slip of the probe can open one or more of these. 32V unregulated is most likely dead and this will kill the HV section. These fuses are "conveniently" located at the rear of the A1 board and are not east to reach or replace.
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Michael Lynch
Dardanelle, AR
Michael W. Lynch