Kyocera Copystar 3551ci no longer working with Yosemite 10.1.1

First time questioner, so please bear with me. My office uses a networked Kyocera Copystar 3551ci multi-function copier/printer. I upgraded my mid-2011 MacBook Pro to Yosemite when it was first released and have done all updates -- currently at 10.10.1. Additionally, before going on vacation I was using the most recent TaskAlfa 3551ci driver (released for Mavericks) and all was working fine. Returned to work yesterday after a month -- tried to print and my MacBook could not connect to the printer. I checked the Kyocera driver download support page, and sure enough there was a new Mac driver (released 12/3). I downloaded and installed it, but the printer still would not connect -- in System Preferences it had the "yellow light." After several attempts I deleted the printer intending to re-add it, but now in System Preferences the printer is not detected at all. Does anyone have any clue as to how to remedy this? I did all the standard things -- reboot printer, reboot MacBook, etc. I am not in my office today, but will try calling Kyocera tech support tomorrow. However, my last experience with them regarding printing from a Mac was less than stellar -- the tech support person I spoke with had no clue how to do anything on a Mac, and neither did anyone else he tried to consult. So I'm hoping someone here has had a similar experience and found a solution. (By the way, I have a small inexpensive Canon inkjet printer as a backup on the same network, and it works just fine. Also co-workers were not having any problems printing to the Kyocera.) Thank you!