Human Error

Human Error is a quest in Fallout 4.

Detailed walkthrough
Enter Covenant and talk to Honest Dan

Find the caravan wreckage north east of Covenant on the road to recover Deezer's Lemonade.

Either explore the files on Jacob's computer, fix the radio in the shop owners house at the far end of town (with a skill in luck of 9 or higher), or pass a charisma check with Penny Fitzgerald.

Find the compound; it's next to the fishing area in a sewer.

Fight through the guards and get to the doctor, or pass a speech check and be escorted peacefully.

Either release Amelia, or Agree that she might be a synth and leave her with the doctor.

An alternate way to start the quest is to simply enter the sewer and follow the three previous steps.

Upon choosing whether to spare or leave Amelia, the quest is completed.

The fishing spot is the location of the compound. The entrance is through the door in the middle pipe down in the water.

Places to investigate:

Bookcase in the center house just inside the door. Sleeping bag between Jacob Ogden's house and the guest house. One can learn about the existence of the compound from the store owner Penny with a Charisma check.

If told Honest Dan about the compound, he's waiting inside the outer door. He agrees to follow, but if the Sole Survivor accepts the compound's deal to let them kill Amelia, he'll become hostile.

Bugs

 * Deezer's Lemonade, might not spawn.
 * Honest Dan becomes hostile upon entering Compound
 * The gate leading into the covenant might already be open even if it's your first time visiting the place, and all the NPCs act like you have already been there and Honest Dan is nowhere to be found, making the quest impossible to complete or even start.