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So the standby indicator never changes state? If so, more than likely, your amplifier has DC Offset(a damaged amplifier inside) which will keep the speakers off, and disable any use of the front or remote functions. If you are interested in having your Sony repaired, please refer to my website, audioserviceclinic.com. You may contact me there. Thank you.
The Efx 12 has two outputs monitor out as well as mix out ( XLR sockets ). If the level bars are moving its an indication that the mixer is working. Have you tried headphones out as well as monitor out. What is your amplifier and speaker setup- you have not mentioned it at all. Even if any PFL switch is on you won't get sound out of the speakers. PFL stands for Post Fade Listen and when any of the 12 channel PFL switch is on only the headphone out put will work.
Given the heat/cold cycles of the storage area along with humidity, I would first suspect poor solder connections. This is not unusual for units of this age. A general overhaul should restore this to operation. This should be a labor only repair unless the output STK is bad. These units are known for having poor connections at the voltage regulators which cause a DC voltage offset triggering the protection circuit. The overhaul should address this as well.
Both units have a problem with the output section. In case 1, the outputs are likely to be shorted. In case 2, the outputs are open. The low level and distortion come from you driving the speakers with the driver section of the amp. Both units will need to see a service provider.