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This alarm sounds occasionally, and may or may not stop the telescope
tracking. This condition is very hard to reproduce in daytime, so if
the alarm sounds please don't cancel it immediately. Go downstairs
and enter the TCS room (CLIP centre), which is opposite the main door.
On your immediate left is a bank of four racks. These racks are
interchangable between the INT and JKT, RA and DEC, drive and torque
(antibacklash), so they're not clearly labelled. If any rack shows
a red fault light, note which rack it is, then enter it in the FAULT
database, once you've cancelled the alarm.