2745: FAN flow corrosion.
Int. print between PCB and ISA-connector (Flashed).
Tested. Wile test green and red LEDs flash shortly 10-20s
after this green stay on. Tested on real 230VAC after safe testing 
with isolated 230VAC input.
3689: FAN flow corrosion. Flash on PCB CPU and ISA-connector.
CPU-board: Attiny45 Microchip are short. Programming the new one 
(Flash; EEPROM; Device configuration Lock&Fuses; Override EESAVE setting).
8MHz Int.osc.LC). Possible to check outside from board. Pin_1 must be opened.
78M05, BC817, 4148, 470k MELF.
PFC-module: UC3855, LM2902 => LM324.