What was found
PHIK - AFTER TWO HOURS OF FLIGHT, NOSE DOOR OPEN LIGHT CAME ON IN ALT, REFERENCE DMI NR 797 NOSE DOOR OPEN LIGHT IN PRIMARY, ACCOMPANIED WITH A LOW RUMBLING NOISE. PERFORMED ALT GEAR EXTENSION OUT OF SEQUENCE PROCEDURES, LIGHT WENT OUT MOMENTARILY BUT RE-ILLUMINATED. REDUCED DIFFERENTIAL PRESSURE TO 7 PSID, LIGHT WENT OUT FOR REMAINDER OF FLIGHT. FLIGHT RETURNED TO PHIK. NOSE GEAR TRUNNION ACCESS PLATES NOT INSTALLED. INSTALLED PLATES, REPOSITIONS INSULATION, GROUND CHECKED NORMAL. (M)