Thanks sir t2erns, your reply makes a lot of sense.
Before I heard about the TSB and being as a known issue to my Rav4, I already had my transmission overhauled 3times, then that's the time I went on researching and found that it was an issue with my ECU.
Now, I'm torn in deciding whether I get this fixed from the repair offers abroad i.e.
2001 2002 2003 Toyota RAV4 Engine Computer Module Repair Kit ECU ECM 01 02 03 | eBay
Or locally at J6 Banawe, they are offering 13K to fix it.
...Or buy a brand new that costs around 60K.
However, I might now consider your suggestion to have it checked by Toyota so as I wont be ending up replacing good parts.