As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE ALTITUDE 350, RECEIVED LEVEL 3 ALERT "AIR MANF 2 FAIL" COMPLIED WITH QRH AND PROCEEDED TO NEAREST SUITABLE KOKC FOUND SYSTEM TEST GOOD PER AMM 36-23-01-4.AS PRECAUTIONARY PERFORMED DECAY CHECK ON ALL 3 MANIFOLDS PER AMM 36-00-01-5.ALL MANIFOLDS PASS