As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - FLT 1072 EN ROUTE. EICAS MESSAGE FOR CABIN ALTITUDE. CABIN ALTITUDE PLUS CABIN ALTITUDE LIGHT ON. COULD NOT CONTROL CABIN PRESSURE IN MANUAL MODE. UNABLE TO CONTROL CABIN ALTITUDE IN ANY MODE. A GRADUAL DESCENT TO 10,000 FT WAS MADE. FLIGHT RETURNED TO FIELD. NO EMERGENCY DECLARED AND FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED CABIN PRESSURE SELECTOR PANEL ASSEMBLY. OPS CHECKED OK. INTERMITTENT OUTPUT. PRIMARY FAILURE WAS VALVE METER. CONTRIBUTING FAILURE WAS THE MODE SELECT SWITCH. REPLACED VALVE METER AND MODE SELECT SWITCH.