TM  55-1520-240-T 7-8.6  APU  MOTORS  BUT  DOES  NOT  START,  ESU  BITE  INDICATES           OR          THEN        (HYDRAULIC FAULT) (Continued) CHECK  APU  PUMP  FAULT LIGHT IS IT ON? REPLACE APU MOTOR PUMP. CONNECT  EXTERNAL HYDRAULIC SOURCE. TO UTILITY SYSTEM. REFER TO TM  55-1520-240-23.  APPLY HYDRAULIC POWER. ATTEMPT APU START. REFER TO TASK 15-1.4. DOES APU START? MODULE  ACCUMULATOR DOES IT INDICATE AT LEAST DOES  APU  HAVE HISTORY  OF REPLACE  APU. HOT STARTS? REMOVE HYDRAULIC POWER. REPLACE APU MOTOR PUMP. ATTEMPT APU START REFER TO TASK 15-1.4. DOES APU START? REMOVE  HYDRAULIC  SOURCE REPRESSURIZE  UTILITY SYSTEM  CHECK  APU  START FAULT CORRECTED 3000  Psi? REPLACE  APU  START MODULE  ACCUMULATOR CHECK APU START ACCUMULATOR.  DOES  IT INDICATE AIR PRECHARGE? REFER  TO  TM  55-1520 240-23. SERVICE  ACCUMULATOR. 7-8.6 END  OF  TASK Change 7-219/(7-220   Blank)