What was found
HYDRAULIC QUANTITY SYSTEM 4 READS 0 WHEN SELECTED ON GAUGE IN LEFT MAIN LANDING GEAR WHEEL WELL. READING APPEARS TO JUMP BACKWARDS WHEN GOING FROM OFF TO SYSTEM 4. NO AMIS HIS, NO EXISTING FAULTS & FAULT HIS SHOWED SEVERAL HYDIM-4 CARD FAIL (INTERMITTENT). REPLACED HYQUIM (MR29334) REF MM 29-33-02 PG 401 & GRND TEST OF HYQUIM FAULTED REMOTE HYD QTY IND-SELECTOR SW (MSG 29505). CONT OF AMIS ITEM 2192016 :T-S REF FIM 29-22 TASK 8 (PARTIAL (PARTIAL). INSTALLED NEW SELECTOR VALVE ASSY. OP'S CHECK NORMAL, NO FAULTS OR LEAKS NOTED.