What was found
AFTER TAKEOFF, ENG ANTI-ICE ON, RECEIVED AIR SYS 2 LEVEL 1 ALERT. 45 SECS LATER RECEIVED MANF 2 FAIL LEVEL 3 ALERT. COMPLIED WITH QRH & DIVERTED. AFTER 4 MINS WITH NR 2 ENG AT IDLE, LEVEL 3 ALERT OUT. RELEASED FOR SERVICE IAW MEL: 36-23-01-02. ON MANF FAIL DET BOX IN CAC, NO FAULTS, AIU NR 1 SHOWED NO CURRENT OR FAULT LAST LEG FAULTS. DECAY CHK ON NR 2 PNEU SYS FOR 32 SECS IAW MM 36-00-01-5, 20 SECS MIN REQUIRED. COMPLIED WITH MEL. MFDC & SENSE ELEMENTS CHK OK IAW MM 36-23-00-0. R & R R2-8990 AS PRECAUTION IAW SMP. MFDC & SENSE ELEMENTS CHK OK IAW MM 36-23-00-0. RAN NR 2 ENG IAW JRH, THROUGH POWER SETTINGS WITH PNEUMATICS ON, NO DEFECTS. DECAY CHK PREV COMPLIED WITH NO HISTORY FOR 99 DAYS. OK FOR SERVICE.