What was found
EMERGENCY EXIT LIGHTS ON RIGHT SIDE OF ACFT CAME ON INFLIGHT. LEFT SIDE STAYED OFF. UNABLE TO DUPLICATE ON GRD. TESTED LIGHTS VIA FLT DECK SWITCH AND OPS NML ON BOTH SIDES. CHECKED VIA SWITCH AT 1L ATTENDANT SEAT AND OPS NORMAL. NOTE: SWITCH GUARD NOT POSITIONED CORRECTLY AND MAY HAVE CAUSED PARTIAL ACTIVATION BY ATTENDANT LEANING ON SEAT IN AREA OF SWITCH. THIS PARTIAL ACTIVATION HAS OCCURRED PREVIOUSLY ON OTHER A/C. GUARD REPOSITIONED. NO REPEAT OCCURRENCE AFTER RETURN TO SERVICE.