What was found
FLT 1060, AUS-JFK, DIVERTED TO MCO, BLEED 2 FAIL EICAS MESSAGE AT 4000 FT, PERFORMED QRH AND PROBLEM RESOLVED. BLEED 2 FAIL MESSAGE RETURNED AT 14000 AND PERFORMED QRH, PROBLEM RESOLVED BUT RETURNED AND DESCENT INITIATED. PSI FLUCTUATION OF <10 TO >70. REMOVED AND REPLACED NR 2 BLEED NAC PRSOV, REF AMM 36-1-03, ITEM 2, OPS CHECK OK.