mariomail -- " I'm confused.."
-- So am I! Terminology probably to be blamed.
"I'm an RCA (079) with an auxiliary hold down."
-- "Hold down" is usually a city term used when a carrier is temporarily filling in on a route.
-- The Designation Code 79 is for an RCA who has been assigned by Form 50 to an Auxiliary route. The route belongs to such an RCA. The RCA is not "holding down" the AUX.
"...was told by my PM I couldn't get my leave for Friday because I was in overtime on Thursday."
-- Politely ask your PM for a reference, preferably one you can actually read.
" I did see that part-time flexible employees leave can be not paid out when they reach over 40 hours in a work week."
-- Article 30.2.O addresses PTF/Leave/Overtime -- A part-time flexible rural carrier is only entitled, on a weekly basis, to a combination of leave and evaluated hours equal to the total of one day's evaluation of each of the assigned primary routes. A part-time flexible may not use leave to generate overtime.
-- A PTF is Designation Code 76, as an AUX carrier, you are Designation Code 79.
-- Politely point out the difference in Designation Codes to the PM. If that has no effect, give your Assistant District Representative a call. Hopefully the ADR can get through to the PM.
-- If the PM continues to go with no leave because of overtime, point out to the PM that scheduling is manglement's responsibility. Knowing you had an approved leave slip, manglement could / should have taken you off the route before you went into OT so you could have taken leave.