This won't help with any plastic surgery or anything else important and you probably don't have the winch, however there are at least some details in the Rugged X winch fitting kit instructions that also describe how to remove and refit the bar inc brackets, mounting points, bolts, torque etc.
Head here
https://toyotamanuals.com.au/accessories and search for PZQ2989470
Not sure you will find instructions for a factory fitted item but if you do magically encounter a relevant PZQ number you could maybe coax out of spare parts, throw it in there also and see what turns up.
Good luck