2003 Honda Accord has broken trunk release; is there a way to open it manually; there is no keyhole.

You can open using a Key FOB or using the button on the driver's door.
Some models do not have a manual access trunk key hole.

If release lever is not functional, use key. If key will not turn in cylinder, spray WD-40 into cylinder and use sawing motion to get key inserted and continue sawing motion to free up lock wafers internal to cylinder so it will turn with key. If this process is not effective, you will need to remove rear seat to access paneling to trunk lock and open accordinly

Might try some graphite lock lube in the keyhole.

emergency release should be in the trunk as for the closing of the trunk, you need to disconnect the cable at the trunk latch until you can get it fixed

the tension spring maybe broken or slipped off

Please Check Near the Driving Seat With boot (rear door) Open Liver.

This is the exact problem that developed on my 96 Honda Accord Wagon. I huddled in the back interior with a utility knife and cut my own rectangular access panel into the plastic. A few inches up from the bottom center (just above the actual latch) I found my problem. A broken plastic clip was failing to hold its end of a metal arm into a hole. I stuck the 'L' end back in the hole and used some wire to secure it. Now I have duct tape decor added to my back interior and a working hatch!

open it manually then inspect its lock and release system if either seem malfuntioned try to junkyard the peices and change em out. otherwise it is in your release lever and that im not sure of. ill do research for ya.

Are the skrews not loose on the other part of the lock inside the boot.?

Open the trunk and pull back the drivers side liner inside of the trunk. You can follow the black cable to the fuel door. When you reach a black wing tipped connector you twist the 90 degrees and it will pop out and the door will open.
What was the original problem?