Sirs planning to buy my first ps4 today. Once confirmed ano need kong gawin para sure na mas tatagal? Palit SSD? Reapply thermal paste? Palit fan in applicable?
If you're getting a fat or slim PS4, I'd skip the SSD and would just get an external HDD. Both fat and slim have SATA2 controllers which will bottleneck the SSD. Not worth it IMO. At least with an external HDD, you still get to use your internal drive simultaneously with the external drive.
Regarding the thermal paste, make sure to use thick pastes which resist "pump out". Stay away from Arctic MX-4 on the PS4. I used it on both my launch PS4 and Pro, and MX-4 pumped out within weeks on both which resulted in loud fan speeds and overheating message. Right now I'm using Gelid GC-Extreme, both of my PS4s are silent now but still too early to tell. It's a thick paste which is actually hard to spread with a spatula so I'm hoping it will resist pump out. And while everything is disassembled, might as well replace the CR2032 CMOS battery and also the thermal pads on the memory chips. I recommend Gelid GP-Extreme or GP-Ultimate 1mm pads. These are really good. I used them on the VRAM chips on my 3090 and memory junction temps dropped considerably. Good luck!