Welcome to the forum. You might have success sending a private message to the original poster by clicking on his/her user name.
Also,
www.keystonerv.com has many model years available. but I see a gap between 2005 and a 2002.
The Keystone 'owner manuals' are pretty generic and general in nature. They cover the entire Keystone family....you will not find anything specific to your Laredo. Reading over the available 2002 manual will likely be just as informative to you as a 2003.
If you have an interest in a certain item, such as your trailer's furnace, A/C, water pump, water heater etc., you will be better off locating the manufacturer and model number of that particular item and Googling it, or post your specific questions here.....lot's of helpful folks that can assist you.
Also, you should follow the 'User CP' link in the upper left of the page and create a signature for yourself that includes your trailer year, model and model #, as well as the year, make, model of your tow vehicle. This will help in getting your questions answered in a more timely and precise manner.