Unsure about 15d and 13a:
13a There could be a PC to repair one leaving IT after repair. V?G?I?L?A?N?E.
15d Leaves sympathetic companion. ??A.
Could be 'vigilante' and 'tea', or 'vigilance' and 'cha' (I am inclined towards the latter (ch=companion). But do not quite get the wordplay in 13a.