What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: DURING CLIMB, UNABLE TO MAINTAIN CABIN PRESSURE. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT BOS. ACCOMPLISH GVI OF OFV FOR OBSTRUCTION. NONE FOUND. ACCOMPLISH DCPC BITE ON BOTH CONTROLLERS PER FIM 21-31-00-810-801. FOUND DCPC 2 WITH LOW FLOW OR HIGH LEAKAGE. BITE CHECK OF BOTH CABIN TEMPERATURE CONTROLLERS IAW AMM 21-61-00. NO FAULTS FOUND. FOUND SLIGHT LEAK AT R1 DOOR SEAL, CLEANED DOOR SEAL (AALA202603021180) IAW AMM 52-41-00. PRESSURIZED ACFT WITH ENGINES RUNNING TO 4 PSI. N2S MATCHED AT 58.8%. FOUND CABIN TEMP SENSOR FILTERS CLOGGED WITH DUST, CLEANED TEMPERATURE SENSOR (AALA202603026339) PER AMM 21-61-10. ACCOMPLISH GVI OF BOTH PACK BAYS. NO DEFECTS NOTED. ACCOMPLISHED CABIN PRESSURIZE LEAK TEST 4 TIMES PER AMM 05-51-91-790-801. ALL TESTS PASS.