By INA ALLECO R. SILVERIO Bulatlat.com MANILA — The Pambansang Lakas ng Mamamalakaya ng Pilipinas (Pamalakaya) and allied groups under the Resist Apeco! Defend Aurora Movement are pressing the Senate to investigate one of its own. In a symbolic protest which saw leaders of Pamalakaya “planking” on massive stones lining the breakwater area in front…