F&P HC254 Menu

[SydCPAP]

Hi All.
This is my first post, but I was reading here a lot. I have hired Fisher & Paykel HC254 recently with an option to buy. I was able to figure out one hidden option by pressing "Down" and "Next" and holding them for 3 sec. Now you have some numbers revealed. One of them I guess is total hours for machine which in my case is 250h, but in main official menu the figure is 86h. I was using it for nearly 2 weeks. The provider said the machine was new, but it looks like hidden hours are greater than mine. Can somebody with similar F&P check this hidden menu please and post the difference in reading with main menu.
Also a week ago I pull out USB stick and check my parameters with the provider, but when I put it back I cannot see AHI reading, totally gone from the main menu, all other numbers are there though.

[SydCPAP]

Further to this issue - pressing and holding top left square button and "Next" button for three seconds opens another hidden menu where AHI reading can be either turned On or Off. The default is Off and every time USB stick is out, the machine goes into default mode and I have to manually enable AHI reading. You can manually change pressure settings from that menu.
Also just once both pressure settings were corrupted after pulling out USB stick - it went down by 1. I guess it needs to be checked every time the stick is out.