75 evo emits electrical charged odour.

Cleaning solutions being used may have seeped in and are causing corrosion to pcbs. Inspect the wiring and control boards. Look for signs of liquid damage/corrosion. If the room its in is humid that would also cause the problem

Most likely the motor capacitors for the lift motor inside the base.  There are typically two of them, one above the other. When they degrade, the overheat and emit a foul "electronic" odor. When you remove the front panel, you may see oil leakage or hear sizzling if operating the base up or down.