What was found
INSPECTION TYPE:N/A ON FINAL APPROACH LEFT HYD QTY EICAS MSG APPEARED WITH GEAR DOWN & FLAPS 20. LANDED NORMAL WITH FLAPS 20. CLEARED RUNWAY & UNABLE TO STEER ACFT. STOPPED FOR TOW. REMOVED AND REPLACED LEFT MAIN GEAR DOWNLOCK PRESS LINE AND CARRIED OUT LEFT HYD SYS INSP AND TEST PER MM 29-11-00-2 CONDITION NUMBER 1 ALL CHECKS NORMAL. REPLENISHED LEFT HYD SYS PER MM 12-12-01. ACCORDING TO THE PILOT EVENT REPORT JUST AFTER THE GEAR HIT THE DOWN & LOCKED POS THE LT HYD SYS LET GO COMPLETELY.