Sinumerik 828D Servo Motors Diagnostics

I'm seeking an expert to perform hardware diagnostics on servo motors for the Sinumerik 828D system.

Key Requirements:
- Experience with Sinumerik 828D
- Expertise in diagnosing servo motors
- Ability to identify and report on hardware issues

Ideal Skills:
- Background in CNC machinery
- Proficiency in hardware troubleshooting

Please provide a detailed approach and estimated timeline.