TM   9-2520-272-34&P   2-4.   MALFUNCTION,   TEST   OR   INSPECTION,   AND   CORRECTIVE   ACTION   PROCEDURES (Continued) MALFUNCTION TEST   OR   INSPECTION CORRECTIVE    ACTION 11. VEHICLE   DOES   NOT   ATTAIN   HIGH   SPEED   (Continued) Step   4. Check   pitot   signal   tubes   and   O-rings Clean   tubes   and   replace   O-rings   in   accordance   with   para.   4-28.   Recheck lockup   pressure.   (Follow   task   procedures   in   Step   1.) a.   If   lockup   pressure   is   normal,   go   to   Step   5. b.   If   lockup   pressure   is   outside   of   specified   limits   transmission   is   defective beyond   the   level   of   Direct   Support   Maintenance.   Separate   transmission from   power   pack   in   accordance   with   TM   9-1450-300-34   or TM   9-2350-277-34   and   send   to   General   Support. Step   5.   Check   vehicle   operation. a.   If   vehicle   operation   is   normal,   return   vehicle   to   service. b.   If   original   symptom   is   still   present,   transmission   is   defective   beyond   the level   of   Direct   Support   Maintenance. Separate   transmission   from   power pack   in   accordance   with   TM   9-1450-300-34   or   TM   9-2350-277-34   and   send to   General   Support. GENERAL   SUPPORT.   The   following   maintenance   action   is   indicated: Repair   Area: A   problem   in   the   torque   converter   area   of   the   transmission   is   indicated,   with the   probability   that   the   lockup   clutch   and   related   components   are   affected. A   problem   in   the   range   clutch   area   of   the   transmission   is   indicated,   with   the probability   that   the   fourth-reverse   (C-2)   clutch   and   related   components   are affected. Repair    Procedure    Reference: Refer   to   para.4-9   for   lockup   clutch   maintenance   tasks.   Refer   to   para.   4-28   for fourth-reverse    (C-2)    clutch    maintenance    tasks 12. DIFFERENTIAL   PRESSURE   LIGHT   IS   ON PRELIMINARY    TROUBLESHOOTING.    Organizational    maintenance    determined: •  Removed   oil   filter   element.   Element   had   large   quantity   of debris   2-14 Step  1. Remove   valve   body   cover   in   accordance   with   para.   4-5   and   examine area   under   the   cover. a.   If   noticeable   amounts   of   debris   are   present   in   and   about   valve   bodies, reinstall   cover.   Separate   transmission   from   power   pack   in   accordance with   TM   9-1450-300-34   or   TM   9-2350-277-34   and   send   to   General   Support. Para.   2-4