Los Angeles County Deferred Compensation Program will search next month for investment custodial services for its $4.5 billion 457 and $1.2 billion 401(k) plans, said Teresa Gee, administrator. The incumbent custodians are Mellon Global Securities Services for the 457 plan and Wells Fargo for the 401(k) plan. Both firms will be encouraged to rebid. Plan officials are issuing an RFP because its been 10 years since the last search. Further details were not available.