Pia have had a spate of fires due to the incorrect grease being used. When this was happening they left the gear down for a while after take off. Could be related to this or something similar.
As an aside, i watched a pia 747 depart 24l at man (cool evening, wind down the runway) whilst out running along the footpaths. they rotated well into the touchdown zone of 6r and struggled in the air. couldnt have been more than 1000 feet when turning to the east on the desig departure.( i.e very wide right downwind position) Normally loaded aircraft usually about 3/5 grand at that point.
Only a matter of time. Stretching the use of standard weights to incredible levels i'd wager, looking at the reality of the baggage at their checkin.