Originally Posted by NBs996
I didn't know the bit about the optimiser causing 3 beeps... every day's a school day!
Once in service mode and the bikes battery is disconnected, the bleeps come from the alarms on board battery. If it stopped when you turned optimiser off then the internal battery has given up. Usually takes about a day to die if battery is good.
Not a major problem, but it means that if the main battery is disconnected the alarm won't go off. You can replace the backup by taking the lid off the alarm. It's a rechargeable PP9.