What was found
CLIMBING OUT OF SLC THRU 10,000 FT NR 3 MANIFOLD FAIL LIGHT ILLUMINATED, RAN RED TABS AND RETURNED TO SLC DUE TO ICING CONDITIONS. ALSO WING ANTI-ICE WAS NOT ON AND NR 3 TEMP GAUGE WAS RED-LINING. PERFORMED NR 3 SYS DECAY CHECK RAN ENGINES AND DETERMINED NR 3 ENG BLEED SYSTEM RUNNING HIGHER TEMP THAN NR 1 SYSTEM, ACCOMPLISHED DECAY CHECK USING ENG, DETERMINED NO LEAKS IN MANIFOLD. FOUND LEAK IN AC BAY 3 AT THE TRIM AIR PRESSURE REGULATOR VALVE ROTATED CLAMP AND REPLACED FILTER SEAL LEAK CHECKS GOOD NOW, REPLACED SENSE LOOP IN THE AC BAY AS A PRECAUTION ALL WORK DONE IAW SMP. RAN NR 3 ENG AND PERFORMED NR 3 PNEUMATIC SYS TEST IAW JRH 7-3. ALL CHECKS NORMAL. OK FOR SERVICE.