What was found
FLT # 1501, BUF-JFK. NOTE: ON DEPARTURE THRU 400' RA. CAUTION APP 2 NOT AVAILABLE ON EICAS. APPEARED THRU 2,500' RA & APP 2 NOT AVAIL DISAPPEARED, BUT ON F.O. PFD RA OF -5 INDICATED THRU CLIMB UNTIL FL 220 BEFORE DISAPPEARING AND ALL APPEARED NORMAL.; WITH THE A/C AT THE GATE BOTH RAS SHOWED 0. PERFORMED OPS TEST OF RAS REF AMM 34-31-00-710-801-A. OPS TEST OK. ALSO CONTACTED MCC (CHARLIE) TO REVIEW HISTORY AND POSSIBILITY OF 5G RELATED DEFECTS.