First start by the coil,
cut a piece of the wires, strip the wire and solder the clean wires back to the coil.
Check the coil sleeve and make sure to place the coil is in good position back in.
Check the returnspring on the mech while you are at it.
Inspect the eos.
Check the conectors wires fuses and fuse clips on the flipperboard.
If your up to it, reflow the flipperboard, cold solder joints can sometimes be almost invisible remember there is a shaker in this game.
And even new boards can have a problem
Check the voltages coming to the fippers, flipperboard and connection in the backbox
Is the board set for jp and is your powerboard ok?