Whew! After much searching I have found the following definitions for the Durametric TRA and FRA values for the DME 5.2.2. Apparently the later DME versions break down the values into RKAT etc.
The following are the set points for the DME 5.2.2 from the OBD manual that is no longer available available for purchase.
Hopefully this thread can gather some of the Durametric info spread around the various forums etc. where it can be a little easier accessed. So if you have info please don't hesitate to contribute. I know there are some sages out there. TIA.