A: Am bored
B: Need to stay up to make a flip to night shift for next week
C: Happen to have several feet of 5/32" vac line in the garage.
I just replaced all the vac line; the hoses you mentioned at that fitting (that appears to shoot off to the brake booster), both hoses that run to the wastegate actuators (front was a bit of a biatch), and the boost reverence hoses for the diverter valves. Fun fact: my rear diverter valve was loose in its fitting. That could have caused an issue, so OP, thanks for helping me find something to do to pass an hour or so!