Thats it~
2437 replaced HT 3866 for annual check up. it probably ran 86 for at least a week.
I remember 2437 came back to 86 a day after 3688 was back from the check up
because 3866's route display needed to be fixed.
And to Fai: no! It hasnt been out for a long time. "resting" on the 3rd floor at LCK
