Dell EMC VNXe1600 Troubleshooting

I need help with a Dell EMC VNXe1600 storage system that's running in service mode, causing all LUNs to disappear from Windows servers. I've already tried restarting the storage system and checking the system logs for errors, but the issue persists.

Key Requirements:
- Troubleshoot and resolve the service mode issue
- Restore visibility of all LUNs

Ideal Skills & Experience:
- Expertise in Dell EMC storage systems, especially VNXe1600
- Strong troubleshooting skills
- Experience with Windows server environments

Please provide a detailed plan and estimated time for resolution.