GS450H 2007 Model Hybrid problems

[davo1]

Hi everyone...have had our GS450H for almost 3 years now, had the check hybrid error come up a few months after getting her...had a taxi mechanic change out a couple of cells and it was good for over a year. just had the codes come up again, the same mechanic changed another couple of cells, seemed good but a few days later, the error comes up again...we do a long drive to Adelaide and back (Gold Coast...5000kms), it only goes off maybe twice...(I have a Foxwell scanner to clear the codes) he does he work again, this time when we get it back going off several times a day...constantly...no other codes except for the ecb and vsc ones...I am wondering if it could be the converter or even heard that sometimes the gearbox could be at fault (something to do with the oil?) Do not really want to get a new Hybrid battery and then find out it is something else as well...any thoughts are really appreciated