Question

What is recommended as preventive maintenance for a StudioLive 16.4.2?

Answer 1

The mixer should always be stored in a temperature and humidity controlled environment when not in use.

Ensure to keep the mixer clean and dust free as much as possible.  Using a dry paint brush works great for keeping the particles out of the pots and faders.

Also refer to the important safety instructions provided at the beginning of your manual.  http://www.presonus.com/products/StudioLive-16.4.2/downloads