Resolution
Each character in the string returned in the represents a special authority. If the character in the string is a Y then this means the user profile in question does have this special authority, a N used means it does not.
Character 1 represents the *ALLOBJ special authority
Character 2 represents the *SECADM special authority
Character 3 represents the *JOBCTL special authority
Character 4 represents the *SPLCTL special authority
Character 5 represents the *SAVSYS special authority
Character 6 represents the *SERVICE special authority
Character 7 represents the *AUDIT special authority
Character 8 represents the *IOSYSCFG special authority
For example, if NYYYNNYN is returned the user in question has *SECADM, *JOBCTL, *SPLCTL and *AUDIT special authorities.