Prior to turning it on you might want to consider taking the pump off and just checking it is turning freely. It s simple job on most machines.
I have found with machines that have been sitting often the pump is seized or stiff, turning the machine on could inflict more damage by it trying to spin the pump.
I remove them and just turn them a bit to see how it feels, if stiff or stuck i lubricate / soak the internals.
Last week i looked at a pump where it seemed fully seized. After soaking in WD40, olive oil, and a bit of descale it started to free up
and i discovered the ball race in the pump was completely stuffed. I have since cleaned the bearing "holder" bits of metal out leaving the bearings in and it surprisingly is working quite well and quietly. Of course i dont consider it a real "usable" pump but a handy spare part if needed.....
I cant see the pump in the pics but am hoping its under the black control box on the left hand side ?
I would also drain the boiler and manually refill by removing the the anitvac or overpressure valve. I use a bucket and a funnel, this takes the stress off the pump of trying to fill the machine from dry. I would fill to i know the elements are covered with water and maybe even lower the water probe a bit for the start of testing. (or at lest ensure the probe is in a reasonable depth and not to "full")
some machines have an option to fill without the pump electronically via a solidnoid, my concern by doing this in a dry boiler is that the element may turn on while dry. i dont want that to happen so i just make sure its got clean water in there.....
you could also run a multimeter across the elements (power OFF!!) to see that they are showing resistance and not earthing or anything weird
Like the others have said, wait on the descael / clean as it looks in great condition, confirm it wants to work prior to major surgery. In all if you disregard the electronics they are pretty simple machines to look at if you be smart consider how they work and think of the issues before you start taking bits off you will get it going in no time.
I admit i am not a qualified coffee technician, this is not qualified advice and you should at all times consider your safety and others. i always remove the power cord from the wall before any work is done....
let us know who it goes

leeham



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