2008 Silverado Door Speakers Not Working

I am having an issue with my 07 gmc 3500 duramax first od all the door ding and seatbelt dig has stopped working and my front factory speakers that are mounted in the doors are also not working.
2008 silverado door speakers not working. All i want to do is change out the factory door speakers. I have never done any stereo work on my truck before. Chances are thats the problem. I just have the basic stereo.
Its a lot more cost effective and easier just to wire a line level converter to the factory bose radio and use and aftermarket 4 channel amp to the speakers. Average repair cost is 1 000 at 50 150 miles. A lot less time consuming than trying to manually bypass the. The 2008 chevrolet silverado has 5 problems reported for speakers stopped working.
At work we also have a 2008 silverado as a pool vehicle and all of the door speakers quit working in it and only the tweeter speakers in the posts are working. It is unbearable to listen to with. Has anyone out there had the same or similar problem. Hi i am bruceis4u and i am new to this forum.
Factory amplified systems are a nightmare sometimes. I have a 2008 chevrolet silverado extended cab it doesn t have the bose factory head unit. I have a 2008 silverado and noticed my chime was not working. The outputs to the rear are junk.
I would rather fix the speaker and kind of hoping this is an easy fix. Found out gm put the cheapest speakers on the market in them. They work off the front door speakers. Will it be okay to replace all 4 speakers 6 5 in size or should i do 6 5 in the front door and 5 25 in the rear.