*Strange Whine* X74: Stagecoach Western Volvo B11RT Elite i 54271 (YY65 VXN)

South Scotland's 2015 Volvo B11R/Plaxton Elite Interdeck 54271 (Euro 6/I-Shift), new originally to Midland Red South (Megabus) and previously working with South West, gives off a whine (guessing either the transmission or just how the engine fan sounds?) as it leaves Hamilton on an X74 from Dumfries to Glasgow. 20/04/26.