Thankfully you won't have to visit all these locations nor to ask all related NPC's. Here's a list of places and non-player characters who may have some information concerning the android: Megaton - clinic ( Doctor Church), Megaton - Craterside Supply Store ( Moira), Megaton - Nathan's and Manya's home ( Manya), Rivet City - upper deck (talk to Doctor Preston about face reconstructions, you can also go and look for Sister), Rivet City - Rivet City market ( Seagrove Holmes - you have to be persuasive or give him a bribe to find out about Pinkerton), Little Lamplight ( Lucy), Little Lamplight - gift shop, Paradise Falls ( Grouse), Paradise Falls - Cutter's clinic ( Cutter), Paradise Falls - Eulogy's quarters ( Eulogy), Tenpenny Tower ( Herbert Dashwood and Doctor Banfield), Big Town ( Red), The Underworld - Chop shop ( Doctor Barrows), The Underworld ( Winthrop), Citadel ( Scribe Bowditch). I assume that you'll find clues of android's existence long before you take trip to Rivet City. You can find him in the science lab located in Rivet City. Solution: The most obvious way to begin this quest is to talk to Doctor Zimmer. Received from: automatically after finding a clue about replicant's existence or from Doctor Zimmer

How do you get into rivet city