Thought I’d draw attention to something that worked for me on my Plextor PX-716A TLA#03xx, TLA0304 when I bought it. This worked on the Plextor drive first and then on 2 other xbox1 DVD-ROM drives. Chances are if this works it means that the ribbon cable’s inner wires is damaged or the contacts at the end of the ribbon cable could have become squeezed so flat that they’re too thin to make a close enough touch resulting in a few “unconnected” lines, between the ribbon cable and the socket, when the laser moves back and forth. We are talking about paper thin metal wires. My remedy seems to basicly make the unit reset the laser power settings like a cold boot on your computer.
“Power Calibration Error” with Plextor (Possible Remedy)