What was found
F/A REPORTS ABOUT CABIN TEMPERATURE, SUGGEST THAT "FWD CABIN" AND "AFT CABIN" CONTROL KNOBS ARE PRODUCING ERRATIC SUPPLY TEMPS THAT ARE INCONSISTENT WITH KNOB POSITION. FOR INSTANCE "FWD CAB" AT 11 O'CLOCK PRODUCES 20 DEG SUPPLY TEMP CONT FROM FLIGHT DECK DIFFICULT/INCONSISTENT WITH ALL TEMP SELECTORS OFF LT PACK TEMP AT 28 DEG RT PACK 23 DEG C. ACFT GROUNDED. FOUND BOTH FWD & AFT CABIN TEMP SENSOR FILTERS COMPLETELY CLOGGED. CLEANED & REINSTALLED FILTERS REF MM 21-61-06. OPS CK OK RAN PACKS NO ERRATIC FLUCTUATIONS NOTED. NO HISTORY 90 DAYS.