Loss of power from GEN No.1

According to the attached schematics, the failure of which specific diode within Generator Control Unit 1 would result in a complete loss of power from Generator No. 1?
  
     
 

We don't troubleshoot component internal workings.

If a system is failed and a replacement unit corrects the problem..... we're done.

Internal repairs are done at the shop level. Tests and certifications are required before the unit is returned to service.