What was found
AT CRUISE FL330, AIR MANF 2 FAIL. COMPLIED WITH QRH AND DIVERTED. RELEASED FOR SERVICE IAW MEL: 36-23-01-02, CATEGORY: C EXPIRATION: 13DEC10 "MEL 36-23-01-02: NR 2 MANIFOLD FAIL DETECTION LOOP NR2 INOP. NO HISTORY 99 DAYS ON SYS 2 MAN FAIL. NO CURRENT FAULTS AIU 1 IAW FIM 36-23 SUSPECT MAN FAIL DET CONTROLLER. R & R MAN FAIL DET CONTROLLER IAW AMM 36-23-01-4. AIR SYS TEST, OPS CHECKS NORMAL IAW AMM 36-23-01-5 WITH NO FAULTS. ALL MAIN LOOPS RESTORED TO NORMAL SELECTION.