Vahe Hayrikyan thought his 200-year-old instrument was gone for good. But a cello teacher nicknamed 'Columbo' called to say he was sure he'd cracked the case.At 2 o'clock on the afternoon of Jan. 6, 1996, cellist Vahe Hayrikyan of Sun Valley parked on North Martel Avenue in Hollywood and entered an apartment building to meet with his pianist about a recital.