# Maintaining ERX Routers

This chapter lists the tools, items, and steps needed for installing and uninstalling ERX router components. Other maintenance procedures must be performed by an authorized Juniper Networks technician.

This chapter contains the following sections:

- Required Tools and Items
- Storing Modules and Components
- Cleaning the System
- Upgrading JunosE Software
- Upgrading NVS Cards on SRP Modules
- Replacing an NVS Card
- Upgrading Memory on SRP Modules
- Replacing SFPs on I/O Modules
- Replacing Fan Trays
- Installing a ERX14xx Model Air Filter
- Installing a Cable-Management Bracket on ERX7xx Models
- Replacing a Power Input Module