What was found
(CAN) DURING APPROACH, AFTER PILOTS PULL LG IN DOWN SELECTION, THERE WAS NO LG EXTENSION. HANDLE WAS RECYCLED, STILL NO LG EXTENSION, HANDLE ILLUMINATED, 3 RED LIGHTS. GO AROUND WITH SUBSEQUENT PUBLISHED, MISSED APPROACH PROCEDURE. QRH PROCEDURE ALTERNATE LG EXTENSION OR LG INOPERATIVE IN HOLDING SUCCESSFULLY PERFORMED, EVENTLESS LANDING. PERFORMED READ OUT OF PSEU FAULT CODES, FOUND CODE DIN01A FAILED & DIN02A FAILED ACC FIM 32-10-00-810-801. PERFORMED FUNCTIONAL TEST AMM 32-31-00-720-801 & FAULT INDICATION RETRIEVAL PERFORMED AGAIN, NO MORE SAME FAULT CODES, BUT SOMETIMES NO HYDRAULIC POWER AVAILABLE IN LG SYS. SUSPECTED LG SELECTOR VLV PIN 48300-3. LG SELECTOR VLV PIN 48300-3 INSTALLED IAW AMM 32-31-06-00 400-801. TESTED OK.