Probably the aircraft with technical problem is PIA Boeing 777-200ER registration AP-BHX that apparently landed at Lahore Airport at 8:15 AM as ferry flight PK-8651 from Islamabad.

Source: flightradar24.com
According to PIA spokesperson, the flight is delayed due to technical problem in the aircraft. A substitute aircraft will depart from Lahore at 6:00 PM as flight PK-751. PIA is looking after passengers at Lahore Airport and has apologized to them for the inconvenience.
Looks like now PIA Boeing 777-200LR registration AP-BGY is going to perform flight PK-751. AP-BGY is expected to land at Lahore Airport at 3:52 PM as flight PK-790 from Toronto.

Source: flightradar24.com
According to information on Lahore Airport website, flight PK-751 is now expected to depart at 6:00 PM with a delay of more than seven hours.

Source: lahoreairport.com.pk
Abbas

