The leasing companies want their aircraft returned to them in the condition in which they were supplied to TCX UK. This apparently will require something of the order of 40 engine changes. Unbelievable.
In my past life as a pilot, I have been through returning aircraft back to a leasing company. And the paper trail is huge. And the above poster is correct .. they MUST be returned as they were delivered.. and as I said.. the paper work must confirm it all.