What was found
APU FAULT LIGHT ILLUMINATED. GROUNDED - YES. BITE CHECKED APU REF AMM CH 49-61-00-700-801, FOUND NEW ACTIVE FAULT MAINT MESSAGE 49-41254 START CONVERTER UNIT SHOWS START SYSTEM INOP, OCCURRED AT 1852Z 27JUN2023. IN FAULT HISTORY FOUND THAT MAINT MESSAGE OCCURRED 1852Z 27JUN2023 & 1341Z 27JUN 2023 FOR 49-41254, ALSO IN FAULT HISTORY MAINT MESSAGE 49-41012 NO APU ROTATION SHUTDOWN, OCCURRED 1341Z 27JUN2023, CONTINUE ON MEL 49-11-01. CSS SUCCESSFULLY PASSED, THIS CLEARS MEL 49-99A.