The ECM60UT31 is a direct replacement SMPS power supply.

I'm not sure if LPSUs are still available for the G-series. I've seen some third-party ones, but none that are as compact as the official Meridian offering.

If you want to have a go at building your own, you'll need a power supply with +5V, +12V, and -12V outputs. The 5V needs to be 6 amps, the +12V needs to be 2 amps and the -12V 500mA.

The simplest fix is generally to replace the existing SMPS with the ECM60UT31 and to replace the capacitors on the backplane.

Good luck,

Steve