For better clarity, it may help by seperating the title PRM into two specific titles relative to the function and pay range the titles command.
PRMC (Person Responsible for Maintenace Control) - applicable to Operator only, controls maintenance scheduling, monitoring, liason to AMO etc on behalf of the operator. $72,000 is a decent salary for the position for a small to medium fleet. This would also depend on expectations of working hours, and or if able to partially be done remotely.
PRM (Can also be referred to as DOM) - applicable to stand alone AMO's or operators which have their