Look in the manual for replacing one of the bulbs in the headlight. It has How to remove the grill.
The 'sonealert' ( Beep Beep ) when you lock the doors has a high resistance to ground thru it's connector from salt and water. It's mounted front and center behind the grill, on the center vertical upright. Simply disconnect the connector, clean it thoroughly, coat it with some Dielectric grease, and put it all back together.
Common problem .... IF you have GOOD Young Ears !!!! I can no longer hear the high pitch when someone comes to me with the problem.
BTW WELCOME to the Board ..... Nice Choice, New or Used ..... Many miles of good motoring ahead.
98S, 2014 Impreza 5 dr Ltd (9 Subaru's since 1978, 7 were 5 sp) ILuvSubaru's