I'm concerned they didn't source a new oil pump - without it, parts of the engine or coolant system may overheat and this could lead to leaks such as the ones you have seen. (mechanics.stackexchange.com)
If the oil pressure is low then a new oil pump can lessen or eliminate the ticking noise. (yourmechanic.com)
The 3.6 R's transmission is a stronger version than that used in the 2.5 - litre petrol Outback models, with various upgrades including a new reverse gear ratio, extra sound - deadening insulation and a new oil pump. (motoring.com.au)