What was found
(CAN) HSI LT/RT DEVIATION REAMINS CENTERED WHEN GPS IS SELECTED WITH NO FAILURE WARNING/INDICATION GPS LAMP REMAINED ON, GPS & TO FROM FLAGS REMAINED VALID). RELAY K2 IN AVIONICS J-BOX #1 FAILED TO ENERGIZE WHEN GPS WAS SELECTED. REPLACED K2. NOTE: TC ENGINEERING REQUIRES THAT THE GPS LAMP BE INTERLOCKED THROUGH ALL RELAYS. IF A SINGLE RELAY WERE TO FAIL, THE GPS LAMP WOULD EXTINGUISH. TH 208/B SWITCHING SYSTEM WAS APPROVED IN THE USA WITHOUT SUCH INTERLOCKS. HSI (GS) VERTICAL DEVIATION POINTER IS DRIVEN DURING GPS SELF TEST. FOUND GPS VERTICAL DEVIATION WIRES CONNECTED TO CESSNA J-BOX. CAPPED AND STOWED GPS VERTICAL DEVIATION WIRES AT AVIONICS J-BOX #2.