How to change speaker and earpiece speaker

Hi sharul,

Sorry to say that iFixit doesn't have the guides you need to fix your phone; as much as they'd like to they're only human and can't be everything everywhere all at once. However, there is a Spanish site called Nadie Me Llama Gallina that has just what you need to replace those speakers. Here are the guides you'll want to follow.

Manuals / Samsung Galaxy A13 SM-A137 / Buzzer speaker

Manuales / Samsung Galaxy A13 SM-A137 / Auricular

Note that the A13 comes in a couple of different models; the device you've filed your question under is the SM-A135 while these guides are for the SM-A137, but hopefully the differences are minor and they'll get you through your repair; just be prepared that some small things might not be exactly the same and use common sense to figure it out.

As far as finding the parts, I don't think it will be too difficult; I usually start with the big three; Amazon, eBay and AliExpress. Do your search using Galaxy A13 but try to confirm the part with your actual model number.