What was found
ON POWER UP, NO REV UNLK LIGHTS NOTED ECAM. ENG NR 1 R REV PRESSURIZED. RELEASED FOR SERVICE PER MEL/CDL: 78-30-01-A CATEGORY: C EXPIRATION: 04FEB07 "MEL 78-30-01-A: ENGINE. NR 1 THRUST REVERSER, INOP. THRUST REVERSER IS DEACTIVATED IN FORWARD THRUST POSITION." REACTIVATED NR 1 T/R AND PERFORMED OPS CK REF JRH USING APU AIR. ALL INDICATIONS NORMAL. REMOVED AND REPLACED PRSOV PRECAUTIONARY REF A300 MM 78-31-05-4. PERFORMED ENG POWER RUN, DID NOT GET "REV PRESSURIZED" INDICATION. CHECKED OPERATION OF T/R USING APU AIR AGAIN WITH ALL INDICATIONS NORMAL. RETURNED VALVE MPN 320522-5 TO TSP.