What was found
3 HRS 46 MINS INTO THE FLIGHT RECEIVED A LEVEL 1 TIRE PRESSURE LOW. THE LEFT NOSE WHEEL SHOWED 132 PSI, THE RIGHT SHOWED 178 PSI. DURING THE REMAINDER OF THE FLIGHT THE PRESSURE DROPPED DROPPED TO 88 PSI FOR THE LEFT AND 160 FOR THE RIGHT NOSEWHEEL. AFTER LANDING TAXI AND BLOCK IN THE LEFT PSI CAME UP TO 111, THE RIGHT TO 221. VERIFIED TIRE PRESSURE INDICATION, REPLACED LH NLG TIRE PER ABOVE REF, TIRES SVC'D TO NORMAL LIMITS, OPS CHK GOOD