MMM V2 to V3 replacement plan still available?

I have an old V2 that was used* with 6S and the 2650kv motor in a Revo and both STILL work perfect. Running v1.21 software. The only thing Ive replaced was the fan(a few times). Was going to send it in to Castle to get it swapped out for the new version, but why? If it aint broke dont fix it.

*beat to hell

My ESC has the power input wires soldered directly to the board, so early v2?

I recently started using 4S for racing. The 6S was fine for messing around, but under race conditions it made everything to hot.