Had the opportunity to look at cockpit indications in a 767-300ER simulator. With c/b C829 BAT BUS DISTR popped, there are no adverse indications in the cockpit (e.g. no EICAS messages present). Essentially you wouldn't know this c/b was popped unless you physically looked at it and saw it out.
I then took the liberty of putting the simulator at cruise, failed the center hydraulic system, and pulled the C829 BAT BUS DISTR c/b. Incidentally, the gear handle was inop (as expected w/ a ctr hyd sys failure). The ALTN EXT function of the landing gear was inop as well. I then pushed the c/b back in, kept the center hyd sys failed, and the gear dropped when I selected ALTN EXT a second time.
In other words, SP-LPC operated as designed.