My dad recently passed . My mom doesn’t know the combination of the Brinks 5059 safe . The s/n 2001158646 The key # 3289 How can I open the safe to reset a new code?

SOURCE: brinks fire resistant safe model 5059 instruction manual

To bad you dismantled. Here is the turning sequence:
General Turning Sequence Instruction NOTE SAFE MODEL 5054/5055/5059/5080/5081/5084/5111/5190/5195/5575/5700/5702.

Combinations consist of FOUR (4) positions (numbers).
BEFORE YOU START
Before you begin, please clear all settings by turning the dial CLOCKWISE (to the right)
three times. We also recommend to try the procedure with your safe door open first. Then
follow these steps:
TURNING SEQUENCE
1. Start the dial on 0 (zero).
2. Turn the dial to the RIGHT, passing your first combination number FOUR (4)
times and stopping at that number on the fifth time around.
3. Turn the dial to the LEFT, passing your second combination number TWO (2)
times and stopping at that number the third time around.
4. Turn the dial to the RIGHT, passing your third combination number ONE (1) time
and stopping at that number the second time around.
5. Turn the dial to the LEFT, to the last combination number and STOP.
6. Insert the key in the cylinder lock and turn RIGHT to open.
Your safe should now be opened.

SOURCE: brinks fire resistant safe model 5059 instruction manual

Here is the turning sequence:
General Turning Sequence Instruction NOTE SAFE MODEL 5054/5055/5059/5080/5081/5084/5111/5190/5195/5575/5700/5702.

Combinations consist of FOUR (4) positions (numbers).
BEFORE YOU START
Before you begin, please clear all settings by turning the dial CLOCKWISE (to the right)
three times. We also recommend to try the procedure with your safe door open first. Then
follow these steps:
TURNING SEQUENCE
1. Start the dial on 0 (zero).
2. Turn the dial to the RIGHT, passing your first combination number FOUR (4)
times and stopping at that number on the fifth time around.
3. Turn the dial to the LEFT, passing your second combination number TWO (2)
times and stopping at that number the third time around.
4. Turn the dial to the RIGHT, passing your third combination number ONE (1) time
and stopping at that number the second time around.
5. Turn the dial to the LEFT, to the last combination number and STOP.
6. Insert the key in the cylinder lock and turn RIGHT to open.
Your safe should now be opened.

SOURCE: Besides the phone number or

Brinks safes are very reliable and secure, Unfortunately there is no way of recovering the the combination of the same without speaking with manufacture. Now you could do it the old fashion way that is to listen to clicks from the combination lock while moving the nob, However this takes alot of practice. The only the I would suggest to do is to speak with the Manufacture. I do appoligize once again and I hope you have better luck. Have a good day

SOURCE: lost combination model 5059 brinks key

if no key -- try to contact the manufacturer customer service,. be near the safe when calling in, they may have some number or other reference on the safe to help you out with that one... alternatively your local locksmith could assist (for a fee)

Best regards
Ck