Adjusting the height of the bridge requires taking out the bridge and shimming it, which involves some woodworking skills (unlike an electric guitar where you can adjust bridge height and intonation with screwdrivers and or hex wrenches)
This should be possible to fix, depending on the cause, but because this is an acoustic guitar adjusting the action, frets and any major neck issues is a job that should be looked at by a qualified person. Keep in mind that your Alvarez is not a hugely valuable guitar, so you want to set a budget and get an estimate.
IF it's fret buzz, the solution can be simple or difficult. Usually means the neck is not right. Many ways to fix it, but the best way is usually by getting the neck just right. IF it's buzz in the amp from the piezo electric pickup, that's another problem entirely. Could be a loose ground wire, may need shielding, or may simply need to be attached better. Got to see it and hear it to determine what the problem is and the best way to proceed. Contrary to what people think, the neck should not be perfectly straight when under string tension. it actually should be bowed forward, but just a bit. Fret buzz is easiest to fix by raising the bridge. This can be done a number of ways, a shim under it is the quickest and easiest, but only when someone sees it can they tell what way to go. Sometimes, you need a taller nut. Trouble is, these will change the string height all along the neck, and playability sometimes suffers. I've seen them set so high that they were virtually unplayable. Me, I like them as low as possible without fret buzz.
You might try to find out through Google. It may be made in either China or Korea. As long as you quote the number of that model which should be on the inside of the guitar if you look through the hole in the centre of the top of the guitar where the strings run across. Best of luck.
I have a few questions before trying to be precise-Is this supposed to have been handmade by Kauzo Yairi?.Do you have a pic of the guitar?.I got a guitar around '1966-handmade
with the writing inside saying something like this-CBS Masterworks handmade by K Yairi ser #... i eventually settled on a price between $5- and $ 7000.00 CDN.That was through an insurance co about a year ago.