p. 43 "Note that each person, device, vehicle, armor, or other piece of gear can only have one attempting healing or repair test per period of combat; you can’t just make test after test until all damage is healed or repaired."
These healing attempts can come from any source, Biotech or Spell, or maybe even some Adept-healing Shadow Amp, but you cannot use them over and over until you are full. Plot Points can also be spent to heal or to "top-off" after a Healing Test. Plot Points are not an attempt.
Of course, if your players and you WANT it to work that way, you can; this is Anarchy after all. Do what seems fair, balanced, and makes for a better story.