Serviceman's PDA

After searching a soldier's body at Cordon, you find a report on a scientific research team that disappeared in the Zone very recently. The details are in his PDA, which is missing from the body.
== Walkthrough ==
The quest starts with picking up the document from the body under the road bridge at Cordon. On the opposite hill across the road, a mercenary sniper with a silenced rifle appears, and tries to kill you. As you likely don't have proper guns by that point, the OP-style way to deal with him would probably be to drag the body closer to the spawn point of the sniper, and take the document after that. The rifle is broken beyond repair, you can stash it and sell to Bourbon later.
Picking his PDA up also starts Sniper Fenrir.
=== Find the bandit who stole serviceman's PDA ===
The bandit can be located at Dump in the swamp, pretending to be a wounded stalker; his position is marked in your PDA. His accomplice at the construction site will snipe the unsuspecting stalkers trying to "help" him. After approaching the place where he could be found, 5 mercenaries will spawn.
=== Find the bandit who took serviceman's PDA from the wounded bandit ===
The bandit's name is Frayer. Initially, he spawns near the "wounded" bandit, at 9/10/11:00PM (randomly) of the same or next day in which you searched his body. Then he starts periodically traveling each few days back and forth between Agroprom Underground and the bandit base at Dark Valley, and can be found in either one of those locations or somewhere in between. Most likely you'll find him at Agroprom Underground, on an occasion. Don't bother rushing it, this questline won't meaningfully advance for quite a while.
Another way to locate Frayer is to ask Docent, one of the technicians in Barkeep's backroom in the Bar. He can locate any quest-related NPC and place a mark on your PDA map.
=== Find the man who got the serviceman's PDA ===
After stealing the military case from Agroprom in Find documents of the military, travel to Dump and talk to Prapor.
Turns out Prapor has that PDA, but it's broken, and he will only give it to you for 10 Scientific medkits.
Bring him the medkits, get the broken PDA in return. Prapor will direct you to Barkeep, saying that he knows a person who can fix anything.
== Notes ==
* The body of the soldier at Cordon is set to not decay, so you won't lose it.
== Bugs ==
* If the quest is started during Take the information from the scout (saving Nimble), the mercenary could easily kill an important NPC, such as Tolik. Don't do that.
* The bandit at Dump will get bored pretending after a few days, and walk to Cordon's ATP. He will still be marked on your PDA's map, though. He might get killed by stalkers attacking the ATP (or anything else), and his body will eventually decay into a zombie after a few days, losing his inventory and softlocking the quest. Just don't delay this too much and all will be fine.