What was found
AIR INTERRUPT, EMER DECLARED, LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. DURING CRUISE RECEIVED HYD YELLOW RESERVOIR LOW LEVEL ECAM MSG. R & R YELLOW HYD SYS LOW LEVEL SWITCH IAW AMM 29-13-11. PERFORMED OPERATIONAL CHECK IAW AMM 29-31-00. PERFORMED LEAK CHECK. SYSTEM CHECKED NORMAL.