TM 5-4220-231-14&P TROUBLESHOOTING MALFUNCTION TEST   OR   INSPECTION CORRECTIVE ACTION 1.     PRESSURE LOSS    AT   DIVER    SUPPLY HOSE. Step 1.    Check the    LP   gage on   VTA   panel. If the   gage reading is   at   normal     operating pressure, the malfunction is  downstream of  the    gage. Go   to   Step 2. Step     2.     Check red,    yellow,     and    green diver    supply valves on   VTA   to   ensure they    are    open. Open     valves. If gage indicates below    normal     operating pressure, check supply hoses for   kinks    or crimps. Straighten hoses. If no    blockage or   kinks    are    found,     supply valves are    faulty    or   clogged. Request intermediate direct    support If gage     still   reads lower    than     normal     operating pressure, pressure is   not   getting     to   VTA. Go   to   Step 3. Step    3.     Check HP   IN  gage     on   DACC. If  HP   IN  gage indicates lower    than     normal     operating pressure, ensure gage isolation valve is   open. Open isolation valve. If HP    IN  gage     still   indicates lower    than normal     operating pressure, HP    air   is  not   getting     to DACC. Go   to   Step 5. If  HP   IN  gage     on   the    DACC    shows normal     operating pressure, the    problem is  downstream of   the    gage. Open crossover valve    on    DACC    to   charge secondary air   supply side    of   DACC. If malfunction is  corrected, the    problem is   in  the    primary     side     of   DACC. Perform the    troubleshooting steps for   malfunction #2    of  this    section (DACC     Primary Air  Supply Malfunction). 3-9