I found it. PS0B is "sCO Maintenance to protect a trip; sCO Flight Attendant observation; Flt Ops mandatory travel"
Originally Posted by
BMEP100
Deadheading is usually PS0B, as I recall.
Never 4 people on one name, with a boarding date 6 months in the future.
DH is PS0C and PS0F for Captains and First Officers respectively.