Cincinnati HPC-630xt power supply malfunction

Hello, I'm getting a Red alarm with "Power Supply Malfunction" as the code. You must power machine down in order for it to clear. It seems to happen mostly when air temps start to rise in the summer. I'm assuming the power supply for the PC is going bad? I've searched a few threads and haven't been able to find a good replacement for it? Does anyone have good suggestions? I have a few of these 630's at my shop so it may be a good idea to replace them all. Any help is appreciated. Machine has the Siemens Acramatic 2100 controller.

It would help to know what control you have!!!!

Sorry I thought I had that listed, It has Siemens Acramatic 2100.