Loss of and the hybrid system malfunction light

I have Toyota Aqua. I had an issue in my car. When I accelerate the car, it started jerking and loos of and error light. I ignored the error and removed the code when appeared for the first time. I was not well aware of about the hybrids only I learnt to check the battery health and purchased a lot of scanners before I bought the car. I have imported it. It mileage was 16kms and now it is providing 65k mileage. It was my mistake so the error occurred then I visited a mechanic recommended by someone who is only expert in the hybrid vehicles. He checked the error code P0A78, drive motor an inverter performance and told me that the inverter should be changed. He said that he would only charge if the change helped. But I didn’t work properly. The problem was not solved at all. H again fitted the original inverter of the car and removed his and said that the problem is in the transmission. I had no trust him and he didn’t believe on me when I asked him to check all connections first. I said him that it will not work properly because it is too much high voltage system if there is any fault in the connection. I am an electrical engineer and I started the troubleshooting after returning.
I came to know that the normal scanners only help in diagnosing the error codes. To diagnose the issue exactly, other three digits info codes are there. Only Toyota tech team can read these codes only. I have booked the Chinese copies also fortunately. I came to know that this problem is occurring due to some sort of short circuits in the hybrid system of the car o r due to the high current in the inverter. . I pulled out the freeze frame data, and found that yes, the inverter was working overtime boosting voltage, and when it reaches a threshold, the ECU shut it down, causing the jerks. The error code on the ECU was as something wrong with the drive motor A, which is the MG1, to which this voltage was to be provided. I came found that no sufficient supply of voltage is given to MG3, due to which inverter started producing high voltage, and get shutdown by the ecu, causing jerks and the ecu deciding that the MG1 performance is not up to par. I checked to the process to resolve this problem, and found that I should check the wiring connections. Now, I knew the connections to MG1 must be the problem area, because that is what is giving the error. MG1 is in the transmission, so went to an electrician, and told him to check all the grips connected to the transmission, and voila, this little connection over there, a grip was loose, not properly locked the one u can see here in the pics. I fixed that, and took the car for a spin. No issue found after testing for many times.
Finally the conclusion is that if a hybrid system malfunction error in your car, go for scanning it with Toyota tech team, get the error code and info codes and diagnose it properly. By going to untrained and mill mechanics it will take a long time and will be a wastage of many and resultantly issue will not be fixed. Not only traction battery causes all hybrid system malfunction errors. Dont misguide people, let them diagnose the issue first, and then tell them how to fix it.