I just had a 384i crash at a remote site and the front desk personnel told me the led's on the main psu are solid on -55, and blinking on the rest. Is this sufficient proof of power supply failure? I'd like to save some gas and just order one.

Should be solid on all 3 leds

The main PS should have 4 leds. -55 5 -9 +9. The expansion PS has 3 leds for -55 -9 +9.