Are you experiencing real world issues ( buffering etc ) or is it just the poor reported upload speed of the wired smart TV speed app that is concerning you ?, or does the TV app simply confirm the issues you have using streaming apps on the TV , and WiFi devices….gimmick TV ‘apps’ tend to go unsupported, and shouldn’t be relied upon , especially if it’s the only ‘evidence’ of a wired performance issue.
As already stated , your optical path , is identical to the neighbours who don’t have any upload issues, so that kind of eliminates the PON itself as being faulty , the non common parts of your access onto the PON are your individual optical ‘lead in’ from the CBT to the CSP , the optical cable between it and the ONT and the ONT itself ( and the splices between the cables ) , it’s pretty difficult to see how the cable or cable splices can only affect upload , so that leaves the ONT…..seeing as you are getting an OR visit anyway, and as nothing more than a process of elimination you could ask for it to be changed , the router already has been changed.
Assuming OR change the ONT , if the issue remains , then I would suggest the issue cannot really something that your ISP or OR are responsible for, without you first conclusively proving poor upload with something like a wired PC
