Intriguing, thanks Sky;
The fuel quantity could have been switched from Kgs to Lbs via the config mode or by an internal fault. Either would have been recorded in the memory.
If it was an internal fault, we would have known about it by now via a service bulletin or possibly an AD.
http://www.aaib.gov.uk/cms_resources...4%20G-SPAO.pdf
"The Central Panel Display System (CPDS) displays cautions and fuel status information to the pilot. It also records internal display system faults but no information relating to its indications. The displays did record flight duration and work is being carried out to link this duration, and the conditions required to start and stop this recorded duration, to the flight path of the helicopter. A fault relating to one of the display systems was recorded and further work is being undertaken to establish the meaning and possible causes of the fault."
It'll be interesting to find out what that fault was.