Is this the address you are looking for? I took this from a post over there. Sailorbob seems to be the man with the info.

0x2CD34 - HWAC2, HWAD3, HWMD3
0x2CEF2 - N4AG9, N4AGB
0x2CEE4 - N4AFF
0x1CEF4 - N4MG3

The above addresses all assume 256k bins.

The parameter is within the first few bytes of data block 6 in the above strategies so if your ecu is not covered by one of these it might be worth looking in that area of the bin.