Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Diverted; Flight Crew Landed As Precaution
Aircraft
FL300. Cabin pressure climbed to 10;000 feet. Diverted after [requesting a] clearance to a lower altitude. Ran proper checklists. After landing found out heat exchanger failed at weld point. No injuries. Overweight landing uneventful.
B757 FO reported loss of cabin pressure that led to a decision to divert. After landing a failed heat exchanger was found.