2008 Evinrude E-Tech 200-250 HP Service Manual, Page 342Get this manual
TRIM AND TILT
Disassembly
WARNING
Before removing the manual release valve, operate the unit to the full UP position, then run the unit down momentarily and loosen the reservoir cap one full turnTo avoid personal injury, always wear eye protection when servicing the hydraulic unitSince there might be significant residual pressure behind some components, cover each component with shop cloth as you remove it