There are only a handful of PMCO 752s on EWR-LAX, and there is always the possibility of an aircraft change to a non lie-flat aircraft.
Right now I know the weekday 1:15pm and 3:20pm EWR-LAX flts are on PMCO 752s. Don't expect a CPU, and an RPU/Miles will be tough as well. I'm looking at the 3:20 on Aug 5 and at this point there are only 5 F seats left.