The photo above shows the side(auxiliary) board of the PSU with one of the "72C5" parts towards the center(use slider at bottom of this post to move to the center of the photo). I've marked the connections as follows;
Pin 1 (Blue) : Adjacent via connects to Microchip dsPIC33FJ64GS606 pin 26 (VDD) (towards the right side of the photo)
Pin 2 (Yellow) : Connects via resistor "91B" to the LM393* opamp's pin 5("+" non-inverting input)
Pin 3 (Red) : Via connects to the +12VDC main output of the PSU
*Side Note: The LM393's opposite(upper) side opamp is associated with the OVP(Over Voltage Protection)
Image from Hopper's hack on YouTube ("HP HSTNS-PD43, Hacked, OVP, 15.5 VDC")
Adding a resistor between the 393's pin 3(or lower solder point of resistor "05C" on pin 3's 1 o'clock direction, for easier soldering) and a convenient ground point, alters the sensed OVP voltage allowing a boost of the main output voltage from 12V to say 14~15V.
The voltage can be increased by adding a resistor between the variable pot's upper left pin(or the adjacent capacitor's upper solder point for easier soldering as these two points are connected) and ground(e.g. the 5th exposed copper land shaped like a "Q" among the series of lands, right of the variable pot).
I've probed and traced this side board's key circuits and intend to share the partial schematic once I get my sketches transferred into a schematic software, for more interesting discussions...
Thanks in advance... Cheers...