Possible? Sure.
For whatever reason all of the RVs I have had, "leak down" propane once you turn off the tanks after a few weeks.. So I always ensure I turn off the propane tanks once I am done camping..
One would think that one should be able to turn off the propane and the propane and pressure would stay inside the lines.. Nope, always have to bleed the air out of the lines each time I turn the tanks off for a week or so.. For the record, that includes installing brand new regulator and pigtails for good measure..
I suspect that the propane can migrate through the rubber hoses plus the rubber in the regulator over time slowly enough that you cannot smell the odorant.
As far as you regulator, Try some different supplier sources..
Quick Internet search for your model I found price of $35
HERE (disclaimer, never done business with them).
THIS place lists it for $48 (never done business with them).
THIS place lists it for $66, never done business with them.
Camping World lists it for $75.. Bought a few items from them although typically over priced..
THIS place lists it for $47 , never done business with them.
The trick I see, is whether any places have them in stock, found many more online sites which say out of stock.
