You can upgrade or replace some of the components of your Dell Precision 5550 laptop by following the instructions in the service manual. You will need some tools such as a screwdriver, a plastic scribe, and an anti-static wrist strap. You can access the memory modules, the SSDs, the wireless card, the battery, and the fan by removing the base cover of your laptop. However, you should be careful not to damage any parts or void your warranty when you perform any upgrades or replacements.