x Power Relay Box and performed continuity check with no defects noted. Also, terminated and mounted APU enclosure connector 48A IJ4. All work done IAW Gulfstream GIV APU Retrofit Wiring Diagram I I59SB49006, Rev L, sheet 3.001, for aircraft effectivity 1001, 1006-1182. Step: 12.1.6 Completed Installed exhaust assembly on APU with new V-c