Interesting coincidence of 4 consecutive flight numbers cancelled:

UA30 EWR-MUC 8/18 763 turned around off Newfoundland, returned to EWR (6 hours flying time total!) and cancelled due to aircraft maintenance
UA31 MUC-EWR 8/19 763 cancelled due to aircraft maintenance
UA32 LAX-NRT 8/18 789 cancelled due to operational difficulties
UA33 NRT-LAX 8/19 789 cancelled due to operational difficulties

UA895 HKG-SIN 8/18 772 cancelled due to aircraft maintenance
UA896 SIN-HKG 8/19 772 cancelled due to aircraft maintenance
UA896 HKG-ORD 8/19 772 delayed 2 hours due to aircraft maintenance

And we thought TPAC ops were doing better than TATL...