Anthony, sent you a PM, but basically no pilot approved Check A as such on the 155, just a walkround. Instead an engineer does a 7/15. Takes 2-3 hours (ish) which comprises a general check, levels etc. Pilot not approved to open cowlings. Not trusted. Or b), another EC money making scheme. Does mean you can take it away for 7 days without checking anything.
Surprised EC haven't developed an engineers seat in the boot. Then at least, when touring, they are on hand.