My finger hurts but here's all the command i found :

NOTE : Beware, some commands will erase your systems, make very loud
noises or insert test systems, please backup first.

Hold all numbers then press power

1- UPDATE MODE (Screen jam)
SCAN, 9, 6
SCAN, 9
LO, 9, 6
L/O, 6

2- RS232C TEST (Some data dumped over serial link)
Hold, 2, .
Hold, 1, 0
Hold, 0, .

3- DUMP TEST (ask for memory address)
Hold, 1, 9
Hold, 3, 7
Hold, 7, 9
LO, 9, 1
LO, 7, 3
LO, 3, 1

4- Frequency counter mode (very usefull)
Hold, 2, E
Hold, 3, 0
Hold, 0, E

5- All memory clear (Erase scanner)
Hold, 8, 9
Hold, 3, 8
Hold, 2, 9
LO, 9, 2
LO, 8, 4
LO, 8, 3
LO, 3, 2

6- Key touch test (White screen)
Hold, 5, E
Hold, 6, 0
SCAN, 0, 3
SCAN, 2, E

7- Key touch test (Black screen)
1, 0, 9
1, e, 8
2, ., 9
2, e, 7
3, ., 8
3, 0, 7

8- Scan Rate test
Hold, 4, 9
Hold, 6, 7
SCAN, 9, 1
SCAN, 7, 3
LO, 6, 1
LO, 4, 3

9- Scan test
Hold, 5, 9
Hold, 6, 8
SCAN, 9, 2
SCAN, 8, 3
LO, 6, 2
LO, 5, 3

10- ON-AIR Test
1, ., 0
1, ., 2
1, 0, 2
2, ., 0

11- NWR-SAME test
1, 0, e
1, 0, 3
1, e, 2
2, ., e
2, ., 3
3, ., 0

12- TRUNK Test (1:MOT, 2:EDACS(W), 3:EDACS(N) 4:LTR)
1, 9, 8
1, 9, 2
1, 8, 3
2, 9, 7
2, 7, 3
3, 8, 7

13- General Test (1:SRC 5k, 2:SRC 6.25k, 3:SRC 7.5k, 4:SRC 8.33k,
5:SRC 10k,
6:SRC 12.5k, 7:WFM, 8:AM, 9:SEARCH RATE, 0ATA SKIP)
1, 9, 5
1, 8, 6
2, 9, 4
2, 7, 6
3, 8, 4
3, 7, 5

14- Battery Saver Test
1, 8, 5
1, 8, 4
1, 7, 5
2, 8, 4
2, 7, 5
2, 7, 4

15- Display firmware version + Serial number ?
2, 9, 6
2, 9, 5
2, 8, 6
2, 9, 5
3, 8, 6
3, 8, 5