Hmmm... maybe you are referring to the quest rumors in Coalition bars about the jh to Heiron? The coordinates given above were all 3 access points to Gurm from other systems. I'll spend some time today checking for Gurm- related infocards.
Navmap shows Heiron jh location at 7F in Gurm, rumors put it at 7G; only one of those rumor cards will need to be changed. But then, the idea of a "rumor" is that it may or may not be true, so some inaccuracy is not inconsistent...