It's kind of hidden. Feed the cat catfood 3 times to make it your friend. Find the cat again in the sewers and give it the hidden camera. That should get you moving in the right direction.
Buy all the items from the mechanics. Meet the mechanics in the building behind the bar. Wait a few days. Use the scanner till it tells you IO is in the sewers. Befriend the chuds by spending time with them after bartending or giving chud king wallets.
