As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INITIAL APU DUCT PRESS 18 PSI L-R. CYCLED APU OFF-ON AND TURN ON L PACK TO GET PRESS TO 30.MAINT TEXT: SUSPECT 'SURGE CONT VLV OR FLOW CONTROL MODULE' DUE TO EXTREMELY SLOW TO ACCEL DURING START. REPLACED APU FLOW SENSING MODULE. DUCT PRESS NOW NO LOAD 34, BOTH PACKS 24, LT OR RT PACK 28, MES 30. STILL HAVE SLOW ACCEL DURING APU START. GENERATED NEW ITEM TO COVER THIS ITEM. REPLACED APU CONTROLLER. REPLACED APU.