There may be several reasons for this error...
Laser drive board #1, most likely faulty. To complete the diagnosis, you can swap boards (for example, #1 and #3 boards, AND ITS CURRENTS, please see att. photo). If after such swap, the CTP starts to show an error E4e03: Excessive current in the LD drive (driver 3 board). - then it's definitely a faulty board.
ExChange Ld driver 1-3 first, if errod goes to anoder ld slot must rapair driver or buy new
If stay the same slot :
Check ld dioda, not all together, separately. If all steps not fix this up voltage 5v