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Clean and reseat any socketed chips first, then start chasing problems.
I cleaned the pins on every socketed chip first video side that fixed the enemy explosions. Next the game side it was the same but then the text appeared and stayed. I swicthed it to test and saw the garbled screen and then the RAM / ROM ok. Played a game put text disappeared in middle of second stage. After I died I switchedit to test again and the text was back but dissappeared again.
Check the voltage on the +5 at the chips, these boards like the voltage to be a bit high something like about 5.15vdc.
Horizontal lines will be something in the character ROMs, the 02xx chip next to them, or their sockets on the video board.