Two separate examinations into the alleged misuse of money at embattled Middle Eastern investment firm Abraaj Group found potential irregularities in its $1 billion health-care fund as well as its other vehicles, according to people with knowledge of the matter. An audit commissioned some months ago by four high-profile investors including the Bill & Melinda Gates Foundation suggested that money from the health-care fund was being diverted elsewhere, said the people, asking not to be identified because the matter is private.