Presonus Studiolive 24.4 2 Service Manual -

However, the unit is discontinued. Many independent repair shops have leaked or archived these PDFs. If you manage to locate the PDF (usually 30-50MB), here are three common 24.4.2 repairs you can attempt:

The 24.4.2 is notorious for PSU capacitor failure. The service manual provides the voltage rails (+15V, -15V, +48V, +5V, +3.3V). Without the schematic, you are probing blind. Presonus Studiolive 24.4 2 Service Manual

presonus-studiolive-24-4-2-service-manual However, the unit is discontinued