Swamp Cooler Start-Up/Tune-Up

[Holden Latimer]

Its time to start up the swamp coolers for the 4-plex I acquired last November. We had a couple breaks in the copper line during the winter that we need to fix. 

I was thinking of using a product like FiberFix, but figured I would just call my HVAC guy to fix the leaks and check on the units since this will be the first turn-on since we acquired the property about 6 months ago. 

He quoted me about $100 to repair the leaks and $75/unit for a start-up/tune-up. This seems like maybe a cheap do-it-yourself project, but wanted to get advice from the BP forum. Should I watch a couple YouTube videos and do it myself or is it worth the expense for a professional to do the tune-up?

P.S. I was told that three of the units were replaced last season and do look in good shape. One unit looks quite old.

Any responses will be greatly appreciated. Thanks!