The plan is seeking managers to handle a total of $5.9 billion.
The systems are looking for passive U.S. Treasury/Agency fixed-income managers.
The plan is relaunching the search after contractual agreement with previously selected did not conclude.
The plan also issued its RFP seeking passive fixed-income managers.
The search follows the termination of its active manager last month.
The plan is seeking a passive global inflation-linked fixed-income manager to handle approximately $850 million.
The authority also hired a total of six new managers within its global equity and fixed-income portfolios as part of an asset allocation policy approved in February.
The plan recently voted to increase its target allocation to diversifying strategies.
The plan is searching for index managers to handle $10.5 billion.
There are no immediate plans to allocate funds to the manager but it will be an option for future use if needed.