BANGKOK (AFX-ASIA) – Seamico Securities Plc said it has revised down PTT Exploration and Production Plc’s (PTTEP) fair value to 150 baht from 155 baht after the company reported flat first quarter results. (US$1=42 baht). PTTEP reported a first quarter net profit of 2.59 billion baht, up slightly from 2.58 billion a year earlier, but…