As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH CONT CAB TEMP KNOB POSITIONED TO FULL WARM ( CLOCKWISE) FLIGHT DECK STILL VERY COLD & MAX DUCT TEMP OF 26DEG C. GROUNDED - YES. (RESOLVED ON W/O: 1974467 TASKCARD: N/R-00005 ) ACCOMPLISHED FIM 21-61 TASK 861 AND REPLACED TRIM AIR PRSOV REF AMM 21-62-01/401. OPS CHECK GOOD. THIS CLEARS MEL 21-21H. SEAMC STEVE NOTIFIED.