Kind inform to factory as bellow
1. After check current transducer T7 & T8 current signal voltage at A27 pin X15:2 & X15:5 is 0V (Should be OK)
2. After disconnect T2 primary pin 1, 2, 3 and energy power 220Vac to secondary pin 5, 6, 7 big noise same level as UPS working in normal operation (Big noise come from transformer need to repair or replace)
3. LCD display can't communication via bypass controller (display show CAN failed) need to re-program or replace A4 card (But UPS system can transfer from Inverter to Bypass and Bypass to Inverter without interruption)