Hammer weights on a Roland RD-300GX

My 300GX has 3 keys that are sagging so I believe it’s due to broken hammers. Syntaur carries them but they’re available in weights 0-3 for white and 7-8 for black. I need the E, F, F# in the center of the 88 keyboard. I’d like to know what key ranges are for those weights so I can order before I take the unit apart.

Also, the E key occasionally does not always sustain when held down. Plays fine otherwise and the pedal works on it. Could this be related to the hammer issue?