B777 Undifferentiated or Other Model
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 177; Flight Crew Total 13601; Flight Crew Type 1290
Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
During our flight from ZZZ to ZZZ1; Aircraft X; a flight attendant seated near the 4L lavatory reported that about 3 minutes after take off he began to notice a urine smell coming from the 4L lav.  The smell began to dissipate about 15 minutes later.  We suspected a contributing factor could be the high deck angle associated with the take off.  This has been a continuing write up for a few weeks.  Unfortunately maintenance personnel have been unable to identify and fix the exact cause.  Hopefully this report will help bring together the appropriate resources to fix this problem.  Our passengers and flight attendants will appreciate it.
B777 Captain reported urine odor emanating from the aft lavatory during initial climb which lasted for approximately 15 minutes.