What was found
ON TAKEOFF AT1000' AGL GOT LEVEL 3"AIR MANF 1 FAIL. COMPLIED WITH QRH, RETURNED TO AN UNEVENTFUL LANDING. PERFORMED DECAY CHECK FOR PNEUMATIC SYS 1 PER MM. CHECKED NORMAL. WHILE T/S FOUND AIU 3 INTERNAL FAULT FAILED TEST. REMOVED AND REPLACED AIU. NO FAULT LIGHTS ON MANIFOLD FAULT INDICATOR. R/R`D MANIFOLD RELAY R2-8962. R/R`D MANIFOLD FAILURE DETECTION PRESSURE SWITCH PER MM 36-23-03-4. R/R`D MANIFOLD FAILURE DETECT CONTROLLER. HIGH PRESSURE VALVE ON NR 1 ENG NEVER MOVES STAYS IN THE CLOSED POSITION THROUGHOUT ENGINE RUN. INSTALLED SERVICABLE HIGH PRESSURE BLEED VALVE. RAN NR 1 ENGINE I/A/W JRH. HP VALVE OPERATED NORMALLY. PERFORMED HIGH POWER RUN WITH WING ANTI-ICE SELECTED.