seat alhambra atomatic gearbox problem?

Hi. I have a Seat Alhambra 1.9tdi with auto gearbox, model 1999, 115bhp. I have some problems with the ecu namely loss of turbo charge (diagnosed as faulty map sensor) and flashing oil indicator lamp/erratic rev counter.
I took the car in for an oil change (thinking the latter problem was in fact a result of overdue oil change) but the fault was still there. I decided to take the car home anyway but driving back the car developed another fault. I could hear the solenoid switch kicking in on the (auto) gear lever and the gears were shifting 1st, 2nd and neutral.
Now sent the ECU for repair but when I spoke to the workshop the person in charge advised me that the gearbox problem is probably not due to any malfunction on the part of the ECU.
Anyone out there experienced anything similar so far?
Thank you for your assistance.
Josie (Malta)